Something has hijacked my Tohsiba laptop running Windows 7. The first symptom I noticed was that Windows would not shut down due to explorer.exe still running. (Task bar showed that no programs were running). When I went to google to search for a solution my search results were hijacked and I was sent to spam sites. So I tried using Yahoo search and the same thing happened. Microsoft Security Essentials does not find anything when I run a scan. I recently restored windows to a previous version after a total crash which I assume was caused by the virus. Also, my laptop is blowing the fan constantly when running Explorer. If MSE can't find it, how can I get to it?