I tried to upload a print screen I'd saved but I seem to have lost Microsoft Explorer - it doesn't respond. Spybot does a full scan then freezes - 8 items relating to risks found (level 5) - probably from a recent free download is blocking - it doesn't reach the 'fix problem' window. Norton Security hasn't picked up a problem. Should I disable Norton? no response from programme each time and same happened when I tried RegCleaner.