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Lsass.exe and svchost.exe are required system files for Windows NT, 2000 and XP. If you delete them without care your system may become unbootable.
Can I delete lsass.exe? svchost.exe?
If you're running Windows XP, 2000, 2003, or NT - Absolutely NOT.
These are required system files. Windows won't run without them. See these articles for more information:
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