Deleting system restore points? I'm willing to bet this is a result of people f-ing with system settings to reduce the space taken up by those restore points in the first place. Didn't Vista, by default, consume massive amounts of diskspace for restores points, and didn't Tom's post an article about working around that and all the other Vista stupidity they fixed in Win 7?
Not saying this isn't a problem, I'm just hoping its not a generic bug that affects everybody. And yes, I read that it supposedly happens on clean-installs, but I don't trust what anyone says. "Why yes, this is a clean install from the bootstrapped CD I created with a bunch of OS tweaks."