Five times on 9/24, I encountered a crash to Blue Screen in this admin user account, identifying the fault as stated in the Subject line. Until a few days ago, after Patch Tuesday, I had never seen this fault in a BSOD or anywhere else. However, a few days ago, this began showing up maybe once a day, a few days ago. Please share with me, have you ever seen this fault? What is the POOL? What is the HEADER? What goes BAD with a POOL HEADER?Am running Windows XP Professional Edition SP3 (x86) on this HP Pavilion with Intel Pentium 4 (519J) 3.0 GHz, 2 GB RAM DDR2 PC2-4200, and 140 GB free on the System drive. Scanned with Microsoft Security Essentials and it found only my Eicar test file. Ran a scan with Windows live One Care Scanner a week ago and it found a few things, removed several and cleaned one, it reported, but it reported no information on WHAT it found, nor WHERE the things were found then.I saw another Error listed by Windows XP in an Application Error dialog box, a few days before this BSOD started. It happened off and on since late June, but the Patch Tuesday updates might have cured it, maybe. It reads, "The instruction at '0x74985dfe' referenced memory at '0x00000020'. The memory could not be 'read'. Click on OK to terminate the program." This seemed to happen most when closing out of a major program such as Firefox v3.6.9 , or once with Open Office v3.2, but it did not happen the majority of closings of either of those programs. This BSOD today was not easy to correlate, sometimes when opening Firefox after updating several of Ffx extensions, but sometimes, Ffx was not started since the logon, and the crashes hit about 2 minutes after Startup/Logon.When the crashes to BSOD happened five times today, I booted into Safe Mode and ran System Restore. It failed when I selected 9/13, but it completed when I selected 9/14's last Restore Point on that date, and that is where I am, now. I rebooted into Safe mode with Networking in order to get this email into this Forum while Windows is still working, but it might not go. I have been running in Safe Mode and so, Microsoft Update site will not confirm that the patches are still installed, nor can I be sure confirm that the SR fixed the crashing without trying it in Normal Mode. Will reboot next and find out. Am wondering, has anybody had any experience with the BAD_POOL_HEADER error/BSOD? Does either of these errors signify a bad RAM chip? a failing hard drive?1 person needs an answerI do too