My system has slowed to a crawl (and rebooting makes no difference). Every mouse click takes anything between 10 and 60 seconds to get a response and most programmes state 'not responding'. When I boot into Safe Mode it's fine, so I'm guessing it's not a hardware problem. I tried rolling back to a system restore point just before some software and updates were installed (they were updates to Acrobat Reader plus installs of a You Tube downloader and a Video Format Comverter) but it makes no difference. I tried looking at the Event Viewer but couldn't make much sense of it. Presumably, if I can start in Safe Mode and then gradually add whatever else loads I can find the culprit - but how do I go about doing that? Don't know if it's relevant but Windows Explorer keeps falling over (which it seems to do a lot) and Kaspersky Anti_Virus was reporting a database corruption, but it now seems to have recovered form that since I rolled back to the restore point - though unfortunately it wont run in safe mode.