Hello Dennis! Thank you for your question. I am a licensed computer professional with over ten years of experience, and I will be assisting you today.
I'm sorry about the issue. Please try this: turn off your computer. Then turn it on, and right after the black screen with white text or the computer company logo disappears, press & release key F8 repeatedly until a menu appears, then you select Safe Mode (note: if there is no menu, then try the same steps again, but this time, press key F8 a bit earlier). Then login and click Start->all programs->accessories->system tools->system restore and restore the computer to any date before this issue has occurred, then wait until system restore shows complete, then check.
Does that work? Please click on the Reply to Expert tab below, and reply back to me, so I provide another solution if there is still any issue. Thank you,