Today, my Task Manager started looking a bit odd. It lacks the status bar and tabs ("Processes", "Performance", etc), so the only thing that shows up is the running tasks window without anything around it. I tried using System Restore, and that brings it back to normal; however, restoring seems to do something to McAfee (it said the detection signature was more than 30 days old, and Windows SecurityCenter reported it as being off), so I don't really wish to have to revert if possible. Right now I've undid the restore and Task Manager is doing this again.
I don't think it has to do with malware, since I've been surfing pretty safely recently and the system behaves no differently from before other than this. What's the problem, and how can I put this back to normal?
I've included a screen capture.