To back up your registry before you install:
Go to start>>run>>scanregw Click OK. It will tell you it didn't find any problems with the registry and it has already been backed up for the day... Do you want to back it up again? Say yes.
How to fix Thumbnail View:
If anything goes wrong after installing these registry files:
Boot to a boot disk Choose Without CD ROM support. At the a:\ prompt type:
You will be looking at a blue screen with some dates. Pick the registry you made earlier today and let it boot up. This will put your old registry back.