I forgot to write my XP version - SP2 with latest updates, integrated in the installation. I had windows (which crushed) installed with integrated SP1, then (long time after) I install SP2 and all available updates. Then (why I did it? ) I reinstall this windows (repair choise in the setup). Setup process was fine, except one moment - setup asked me a file for the motherboard driver, I clicked Cancel. Graphical part of the setup was completed successfully, comp rebooted, and crush appeared before firsh logon. I turned off the autoreboot when system crushes and saw BSOD 7B (0xF894D528, 0xC0000034, 0, 0). I did not know about Repair folder which contain backups of the system registry. I repeated reinstallation about 10 times, and now this folder contain bad backups. Then I installed other copy of the same windows and installed the same drivers and replased the SYSTEM regisry file (in the System32\Config folder) with the working copy from the new windows. And then I take error with lsass. Old windows boots normally if replase all registry files from the new windows. But, ofcourse, without old settings and data. So, I search a way to recover my old windows. Simple reinstallation not helps in first case (reboot before XP logo) and in second case (lsass.exe error). Is it possible to solve my problem? I believe it possible, but I do not know how.