Sorry to hear of your problem and I'm even more sorry to say I probably can't be of any help. Did you install any new programs or change any settings yesterday? Even if you didn't, it may be worth a try to do a system restore.
This is getting more weird. Now I can't even access System Restore. Nothing happens when I click to start the wizard.
I've never needed to do a System Restore before, so I'm not sure how else to run it, other than using the wizard.