I recently ghosted everything on my 20g hdd to my new WD 80g SE hdd. I then formatted the ol' 20g one. I changed the jumpers around, then used PartitionMagic 7.0 to change the drive letters so that the 80g was C: and the 20g was D: Anyway, everything seemed to be going just fine, until I checked in System Properties -> System Restore. I was going to turn off System Restore on the 20g hdd, but I was met with the folliwng message: A quick trip to My Computer revealed that there was 5g free on that drive, so I sincerely doubted that there wasn't enough space. Anyway, it wasn't that much of a problem, because System Restore was still working on the other drive. However, I had another problem when I went to Windows Update this morning to get the patches that microsoft has recently released... They failed to install. All of them. They downloaded fine, but wouldn't install. I went to install them to them from the download location, and discovered that it was, in fact, in a folder called WUtemp on the D: drive. Which my system now seems to think is the system drive. Whenever I tried to run any of the updates, I got the error: Of course, the Cryptographic service was running. Anyway, does anyone know how to tell my stupid computer that the system drive is, in fact, C: instead of D:? Is there some registry key that'll help me here? I'm curious to see what would happen if I removed the 20g hdd from the computer and tried to boot it up...my computer might have fits about an absent system drive But frankly, I can't be bothered... Thanks in advance, guys!