Welcome to WebmasterWorld Guest from 22.214.171.124
Forum Moderators: bill
start > programs > accesories > system tools > system restore
From there you will be able to do a system restore to a previous date. Choose a date that is close, but at a time when you knew your system was working ok.
Your system will do a restore then re-boot. This should solve your problem. If this does not solve your problem you can undo the system restore.
Let us know how you get on.