However, if you get an [Red]Isass.exe (Capital I)[/red] rather than [blue]Lsass (Capital L)[/blue], then yes you have a virus. If you have upto date Windows and Antivirus you shouldn't pick this up. If you can get to the MS Site, download Microsoft Baseliine Security Analyser. At the very least this will instruct you to download the current Malicious Software Removal Tool, which will clear your problem.