Köszönöm!
A leírás szerint a javítás sikerűlt, de további sérülések voltak, így csak az újratelepítés maradt az sürgető idő miatt....
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If your computer keeps booting after your get the lsass.exe error, your security registry hive is corrupt.
rename "c:\windows\sytem32\config\security" to security.bak
then copy c:\windows\system32\repair\security to the location above.
that should do it."
Worked perfectly. You can use your XP disk to boot into recovery mode (recovery mode is just a DOS prompt, there's no reinstallation), or if you don't have an XP CD (and you can't borrow one), you may need to look at a third party tool.
Great advice though, thanks Jon.
the actuall directory of "c:\windows\system32\repair\security" is as follows "c:\windows\repair\security"