My Microsoft Security Essentials had stopped working and wouldn't update so I uninstalled and then reinstalled it. It worked fine, updated and scanned. It found several "severe" threats including Sirefef.W and started the restart problem. I did a system restore to a few days ago and my computer is running without restarting but I'm pretty sure the issue is still there (the trojans and what not). HP Pavilion g7 laptop running Windows 7 64bit Any help would be greatly appreciated.