New
#11
That's one of the first things I do when setting up Windows. This, unfortunately, goes beyond the realm of UAC.
I ended up having to reinstall Windows altogether. This problem was so insidious, I couldn't even do a repair install (as per this tutorial). Setup.exe would just crash immediately after clicking "Install now", where it would normally say "Setup is copying temporary files". Absolutely nothing was immune to this bug.
So, this time around, I've set restore points every step of the way. Hopefully, I won't have to use them.