I just tried "Start, run, control" and it didn't work. The Start bar flashed again, which also means I can't run search and delete anything. If this happened every time I'd've figured out that something was wrong months ago but sometimes it does and sometimes it doesn't. Rebooting doesn't necessarily give me a boot where it works.

Yes Repair was worth a try. It's good to know where the problem isn't; especially when you can't find where it is. Thank you.