Welcome to the Seven Forums. You have come to the right place but you should please give more details about your problem so that others may be able to help.
One thing you can sure do to overcome any problem is to clean re-install Windows. You can either use the supplied Recovery Disks to restore or better still download an official version of your edition of Windows 7 as an ISO image from http://www.mydigitallife.info/offici...digital-river/
, make a DVD out of it and clean install Windows. You can then use your existing Product Key to activate it.