Okay, but just upgrading to SP3 wouldn't cause that or you'd see everyone complaining. Something else is at work. Have you done full system scans with your AV and a good malware utility (such as MalwareBytes)? Hey look - it's your system - if you want to uninstall to SP2 that's your choice, but if it were me I wouldn't. Also, for future reference, before making any such major system change you should create an image of your system drive with a third party utility.