report on an issue when upgrading VirtualBox on a Win7 machine

[Chris Paciorek]

Ryan and I encountered this issue last week. This post is merely
intended to document what happened in the hopes of building up a
catalog of things that can go wrong and workarounds.

User tried to upgrade from VirtualBox 4.3.12 (or .10, I'm forgetting)
to 4.3.20. When he did so and tried to load an existing BCE (version
0.1.1) VM, he got an error message
"virtualbox failed to create COM object"
When he tried to revert back to VirtualBox 4.3.12, the same thing
happened. Multiple re-installations of VirtualBox were not successful.

We tried various things suggested online based on googling the error
message but no luck.

The user happened to have VMWare installed on his machine so
eventually Ryan was able to load the VM from the .vmdk via VMWare,
indicating the VM itself was fine and the problem was with VirtualBox.
But we were not able to figure out what was wrong with VirtualBox.

-chris

[Ryan Lovett]

The VirtualBox log file referenced errors with the integrity of "uxtheme.dll" which pointed to https://forums.virtualbox.org/viewtopic.php?f=6&t=64777. Basically Windows was saying it could not verify that files on his computer were authentic. I suggested installing the Microsoft patch:

# Explanation

https://support.microsoft.com/kb/3024777/en-us

# Download

http://www.microsoft.com/en-us/download/details.aspx?id=45307

to get things working again. The user reported he had already done that but it didn't help.

Ryan

-chris

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