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Pressler2904 | Apr 21 2008 2:19PM GMT
Just a note: lsass.exe is a windows process (Local Security Service). Apparently, your has been corrupted or infected in some way. Follow the steps above and you SHOULD be able to fix the issue: if not, you will need to boot from a parallel installation (another hard drive with Windows installed, or a PE disk like Bart PE or UBCD4Win) and run a virus scan and any other necessary remediation steps from the parallel install.
FYI, one well known virus which might cause issues with lsass.exe is “W32.sasser.worm” - the sasser virus