CLASSPNP.SYS PAGE_FAULT_IN_NONPAGED_AREA Details follow. Ok, around new years my computer blue screened, reset before I could read the error, and never booted back up again, after I changed some sound setings. After I reformatted and reinstalled, it worked fine for a few days, then did it again, with the exact same trigger. Thinking it might be the sound card, I pulled it and enabled the onboard sound. Booted up, ran fine. Just in case, I disabled the restart on system fail option so if I had more probs I could get the message. Since it ran fine after I pulled the card, I concluded the card had went bad, and bought a new one (SB Live) because my onboard sound does not support the 4 speaker setup I have. Plugged new card in, ran fine til yesterday, when I kicked it out of screensaver mode, it gave me the error listed at the top of the post. After that, I could not get it to boot, it would go past the POST and get as far as "Searching for boot record on IDE0" and freeze. Just to see, I pulled the card and put it in a different PCI slot, and it now runs fine again. I wish I could remember if the slot I had the new one in initially was the same as the old one, if it was maybe the slot went bad? Or maybe my HD is tanking? (Really hope its not my motherboard, pain in the arse to replace that) Anyway, can anyone tell me what that error message was indicating?

Check the search menu upper rt corner this page. Probably a memory problem.

I have copied this of some pages at Microsoft. Do a search in Google. M Stop 0x00000050 or PAGE_FAULT_IN_NONPAGED_AREA The Stop 0x50 message indicates that requested data was not in memory. The system generates an exception error when using a reference to an invalid system memory address. Defective memory (including main memory, L2 RAM cache, video RAM) or incompatible software (including remote control and antivirus software) might cause Stop 0x50 messages. A "Stop 0x0000001e, 0xC0000005, 0x00000009" Error Occurs in the Classpnp.sys Driver View products that this article applies to. This article was previously published under Q311278 SYMPTOMS A "Stop 0x0000001e, 0xC0000005, 0x00000009" error may occur in the Classpnp.sys driver on multiprocessor computers. CAUSE This error occurs because a linked list is being traversed while the list is not locked. Therefore, the list can be modified while a thread is searching it. RESOLUTION To resolve this problem, obtain the latest service pack for Windows 2000. For additional information, click the following article number to view the article in the Microsoft Knowledge Base: 260910 How to Obtain the Latest Windows 2000 Service Pack The English version of this fix should have the following file attributes or later: Date Time Version Size File name 16-Nov-2001 12:23 5.0.2195.4643 34,415 Classpnp.sys