Win7 x64 Ultimate.

My Task manager looks like this:
That's the whole thing! No tabs, no bar at the top, no menus, nothing else at all. I've tried System Restore, but my computer just won't do it. Always comes up and says it's unsuccessful. Tried a Restore from Safe Mode, no good either.

I'm unsure when it happened of course as everything else is going fine so I haven't had to use it, and as it's a fairly new machine I'm still installing bits and pieces often, so can't say what broke it.

This is my home machine, I'm now at work. Any ideas on what to try when I get home to fix this?

Keep in mind I'm not THAT geeky :), though changing registry is okay if it's simple enough.