■ Restart in safe mode: Turn on computer, wait a few seconds, start poking the F8 key every second until a diagnotic boot screen shows up. Choose "Start Computer in safe mode."
■ when computer starts in safe mode, there will be a choice screen asking if you want to perform a system rollback using a Restore point or continue to use machine in safe mode. Choose to perform the restore point.
■ Windows will show a calendar with dates of valid restore points in bold. Choose a recent date that you are certain the machine operated correctly, then click ok.
■ Windows will restart, perform the roll-back and restart again. Try your programs again.