In trying to fix an issue today I needed to run sfc /scannow - this raised an issue in that windows is trying to read drive E for the CD rom drive and this is infact on F.
Simple you'd think - pop into the registry and change the default value from E to F - Nope, Even though all of the permissions in the reg are correct - upon restart the settings revert back. I've run the reg editor in tune up utilities and this shows that the registry is write protected. (I'm aware that this is probably caused by some security software somewhere on my pc - but can't think what may have done this. I'm up to date with all of my antispyware and am thorough enough to be confident that this isn't a spyware infection.
I had a little brainwave in that I realised that it would be possible to reassign drive letters to get around the issue - Nope! - locked out of this also with the message "windows cannot modify the drive letter of your system volume or boot volume" - interestingly the drive in question is neither of the things suggested!
Any ideas anyone?