The problem first manifested during normal operation as the screen occasionally going black for a fraction of a second. I noted that there were updates pending so initiated shut down to let them install. Several hours later the install had not completed and no response from keyboard, so powered of machine. Restarted teh PC got as far as teh user selection screen. Selected user, after a few seconds the PC blue screened. Reboted and tried to enter safe mode, another blue screen. Then start up recovery started which after 30 minutes or so went to black screen; on reboot blue screened. Removed graphics card and reverted to built in graphics . Eventualy reboted and startt up recovery intiated got message that Problem Signature was 6.1.7600.16385 (more details available); and that this could not be fixed automatically. The detailed information said Acls on file F:\Windows\System32\bdaplgin.ax are not proper. Since then always blue screens startup repair or normal boot. (BAD_POOL_HEADER - *** STOP: )x00000019 (0x0000000000000022,0xFFFFF8A000165000,0x0000000000000001,0x0000000000000000)on attempting Cannot get into safe mode at all. Attempting boot from windows disk gives similar results.1 person needs an answerI do too

Forgot to say: Windows 7

On Mon, 20 Dec 2010 22:24:33 +0000, John K C wrote: > Forgot to say: Windows 7 Please ask in the correct forum. Not only is your message off-topichere in a Windows XP forum, but if you ask in the right place, youwill have a much better chance of getting the answer you need, sincethat's where the experts in your technology hang out. Ken Blake (MS MVP)