I have Windows 8 pre-installed, and then I installed GRUB with Ubuntu. Ubuntu is not my thing, so now I want to remove it along with GRUB. From what I have learned, with UEFI, GRUB does not overwrite the windows bootloader in the EFI partition and is stored elsewhere. How would I remove GRUB and make my PC use the Windows bootloader instead? It should be noted that I created a separate /boot partition when installing Ubuntu.
Enter powershell into the windows search of the start menu. Look for a blue icon with the label "Windows PowerShell", right click on the that and select "Run as Administrator" within the context menu.
To Mount the EFI System Partition on the given drive use the mountvol command by using the /S parameter. You can chose any free drive letter you want. For example "S".
You can restore the Windows bootloader with a Windows 8/8.1 DVD. These instructions are inspired by Manindra Mehra's answer, but I expanded it with full working details (verified with a Windows 8.1 DVD).
With UEFI you have both a Windows folder & an Ubuntu folder in the efi partition. the UEFI reads the efi entries and adds them to its own NVRAM to remember them. You have to remove ubuntu folder from efi partition first or UEFI will re-add it. Then you have to remove UEFI entry from UEFI.
You should have these folders in the efi partition. Delete only the ubuntu folder. Live installer should show folders. And if only Windows you have to mount from inside Windows the efi partition as it is not normally mounted.
3: If you've done everything right up to this point you should see (depending on your computer) your splash screen for a second and then it will turn into an error screen saying that there was an error with the boot. ("Winload.exe is missing or corrupted" most likly).
For system with GPT partition table, the method provided by @Ganesh Kondal won't work. Using bootsect /nt60 C: /mbr will show that it worked while it really doesn't. Using bootrec /fixmbr will lead to error that "the system cannot find the file specified". If any of the above situation applies, do the following (Using Windows 10 as an example):
I have followed the instructions of the 2nd answer on this thread but after that my pc was stuck in a boot loop. Running the commandbcdedit /set bootmgr path \EFI\Microsoft\Boot\bootmgfw.efi fixed it for me since my Windows Boot Manager path was pointing to grub.
The name of the module. This can be either a library module (a .dll file) or an executablemodule (an .exe file).If the specified module is an executable module, static imports are not loaded;instead, the module is loaded as if byLoadLibraryExwith the DONT_RESOLVE_DLL_REFERENCES flag.
If the function cannot find the module, the function fails. When specifying a path, be sure to usebackslashes (\), not forward slashes (/). For more information about paths, seeNaming a File or Directory.
If the string specifies a module name without a path and the file name extension is omitted, the functionappends the default library extension ".DLL" to the module name. To prevent the function from appending".DLL" to the module name, include a trailing point character (.) in the module name string.
LoadLibrary can be used to load a library module intothe address space of the process and return a handle that can be used inGetProcAddress to get the address of a DLL function.LoadLibrary can also be used to load other executablemodules. For example, the function can specify an .exe file to get a handle that can be used inFindResource orLoadResource. However, do not useLoadLibrary to run an .exe file. Instead, usethe CreateProcess function.
If no file name extension is specified in the lpFileName parameter, the defaultlibrary extension .dll is appended. However, the file name string can include a trailing point character (.) toindicate that the module name has no extension. When no path is specified, the function searches for loadedmodules whose base name matches the base name of the module to be loaded. If the name matches, the load succeeds.Otherwise, the function searches for the file.
The first directory searched is the directory containing the image file used to create the calling process(for more information, see theCreateProcess function). Doing this allowsprivate dynamic-link library (DLL) files associated with a process to be found without adding the process'sinstalled directory to the PATH environment variable. If a relative path isspecified, the entire relative path is appended to every token in the DLL search path list. To load a module froma relative path without searching any other path, useGetFullPathName to get a nonrelative path and callLoadLibrary with the nonrelative path. For moreinformation on the DLL search order, seeDynamic-Link Library Search Order.
If a path is specified and there is a redirection file for the application, the function searches for themodule in the application's directory. If the module exists in the application's directory,LoadLibrary ignores the specified path and loads themodule from the application's directory. If the module does not exist in the application's directory,LoadLibrary loads the module from the specifieddirectory. For more information, seeDynamic Link Library Redirection.
If you call LoadLibrary with the name of an assemblywithout a path specification and the assembly is listed in the system compatible manifest, the call isautomatically redirected to the side-by-side assembly.
The system maintains a per-process referencecount on all loaded modules. Calling LoadLibraryincrements the reference count. Calling the FreeLibrary orFreeLibraryAndExitThread function decrementsthe reference count. The system unloads a module when its reference count reaches zero or when the processterminates (regardless of the reference count).
Do not make assumptions about the operating system version based on aLoadLibrary call that searches for a DLL. If theapplication is running in an environment where the DLL is legitimately not present but a malicious version ofthe DLL is in the search path, the malicious version of the DLL may be loaded. Instead, use the recommendedtechniques described inGetting the System Version.
The libloaderapi.h header defines LoadLibrary as an alias which automatically selects the ANSI or Unicode version of this function based on the definition of the UNICODE preprocessor constant. Mixing usage of the encoding-neutral alias with code that not encoding-neutral can lead to mismatches that result in compilation or runtime errors. For more information, see Conventions for Function Prototypes.
The DLL loader is the part of the operating system (OS) that resolves references to DLLs, loads them, and links them. Dynamic-link library (DLL) redirection is one of the techniques by which you can influence the behavior of the DLL loader, and control which one of several candidate DLLs it actually loads.
If your application depends on a specific version of a shared DLL, and another application is installed with a newer or older version of that DLL, then that can cause compatibility problems and instability; it can cause your app to start to fail.
The DLL loader looks in the folder that the calling process was loaded from (the executable's folder) before it looks in other file system locations. So one workaround is to install the DLL that your app needs in your executable's folder. That effectively makes the DLL private.
But that doesn't solve the problem for COM. Two incompatible versions of a COM server can be installed and registered (even in different file system locations), but there's only one place to register the COM server. So only the latest registered COM server will be activated.
If you want to contribute to the source code in the public WindowsAppSDK GitHub repository, then you'll want to test your changes. And, again, that's a scenario for which you can use redirection to load your private copies of DLLs instead of the versions that ship with the Windows App SDK.
If you're a developer or an administrator, then you should use DLL redirection for existing applications. That's because it doesn't require any changes to the app itself. But if you're creating a new app, or updating an existing app, and you want to isolate your app from potential problems, then create a side-by-side component.
To enable DLL redirection machine-wide, you must create a new registry value. Under the key HKLM\Software\Microsoft\Windows NT\CurrentVersion\Image File Execution Options, create a new DWORD value with the name DevOverrideEnable. Set the value to 1, and restart your computer. Or use the command below (and restart your computer).
Copy any DLLs that you've built locally (and wish to use in preference to the system-deployed DLLs) into the application.local directory. You can pick up DLLs from just about anywhere (we recommended that you use the available macros for your .vcxproj). Just be sure that those DLLs build before this project does; otherwise they'll be missing. Two template copy commands are shown here; use as many as you need, and edit the placeholders.
The redirection file must be named .local. So if your app's name is Editor.exe, then name your redirection file Editor.exe.local. You must install the redirection file in the executable's folder. You must also install the DLLs in the executable's folder.
The contents of a redirection file are ignored; its presence alone causes the DLL loader to check the executable's folder first whenever it loads a DLL. To mitigate the COM problem, that redirection applies both to full path and partial name loading. So redirection happens in the COM case and also regardless of the path specified to LoadLibrary or LoadLibraryEx. If the DLL isn't found in the executable's folder, then loading follows its usual search order. For example, if the app C:\myapp\myapp.exe calls LoadLibrary using the following path:
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