Hi I'm brand new to linux in fact I'm downloading it as we speak but I do have some experience of installing windows 7/vista onto a uefi (windows 8) machine. The presence of UEFI over bios isn't brilliant imo it's pretty fiddley. On Windows 7 for example if you want to replace windows 8 with windows 7 you need to disbale secure boot then you can only install 64 bit versions (UEFI doesn't support 32 bit os's) of windows vista sp3/Windows 7 (home, pro or ultimate). To do this you need to make a bootable usb stick copy the version of windows onto that stick and then move a couple of files and rename a file to get the right UEFI compatible bootloader in place. You then need to boot from a bootable cd (something like norton 360 will do it which has and advanced option that allows you to access a command prompt once there you need to load diskpart and clean the partition and set it as active assigning a disk letter before any other os will install). Once the partition has been cleaned and set to active you can reboot from your usb stick and load windows 7.
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