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http://www.answersthatwork.com/Tasklist_pages/tasklist.htm
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Isass : isass.exe does not exist See LSASS.
Lsass (1)
Lsass.exe
(Microsoft)
Windows NT4/2000/XP/2003 only. LSASS is the Local Security Authentication Server. It verifies the validity of user logons to your PC/Server (in technical jargon : it generates the process that is responsible for authenticating users for the Winlogon service).
Recommendation :
An integral part of the operating system, leave alone provided that its full path as shown in The Ultimate Troubleshooter is either C:\WinNT\System32\LSASS.exe (Windows 2000) or C:\Windows\System32\LSASS.exe (Windows XP/2003). If the path is anything else then you may have a virus (see below).
Lsass (2)
Lsass.exe
(???)
If the full path to this program as shown in The Ultimate Troubleshooter is not C:\WinNT\System32\LSASS.exe (Windows 2000) or C:\Windows\System32\LSASS.exe (Windows XP, 2003), then you have the W32.Nimos.Worm virus or some other virus.
Recommendation :
Make sure you have up‑to‑date reputable antivirus software and then reboot your PC into Safe Mode and run a full virus scan.
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Gør som dannyboyd så udemærket har beskrevet så har du renset din PC