|Oh heck, you've already done a registry edit, perhaps inadvisably, but it's done. Maybe as part of the edit you made a backup? Well anyway, I'm saying if you know exactly where and what you deleted then just write it back in. If not, don't do it.|
Depending on how well you've kept up with creating new restore points, choosing to go back may end up taking you w-a-a-y back, back to before some software installs or OS and driver updates.