Hello, About a month ago i bought this Dell XPS 630 system.Asked the tech guys for to switch the ATI video card with 2 GeForce 9800GT. I installed Vista Ultimate x64 on it and soon after started having problems. First a lot of CRC Errors when extracting archives or installing software(noticed this mostly on large files). A lot of game crashes, some probably due to the crc errors at install. After thying to solve the problem myself after a week i took it back to tech guys as i suspected faulty RAM. They tryed installing a fresh Vista and instantly got c000005 error during instalation. So they decided that the RAID controller must be faulty(they tryed installing with other RAM and other HDD, same error). They replaced the Motherboard but kept all my other original hardware. With new motherboard installation worked, so i took the desktop home, to continue installing drivers. Worken for a few days ok with Vista Ultimate x64 but most games kept kicking me out after a few minutes of gameplay, and many of them while running had strange sound errors, like sudden loud noises. Decided to switch to Vista Ultimate x32 as a friend had suggested, so did that. System worked better, longer play time but still some games kicked me out and had sound errors. Also 3d rendering application crashed while rendering. Most error codes were c000005. Last days have been hell. Comp started crashing BSOD error code 0x0000005 while working in adobe photoshop. At first i suspected a viru so downloaded a trial nod32. BSOD while scanning. Read forums, tryed sfc /scannow BSOD while scanning. Tryed a regclean software BSOD. Uninstalled nod32 in safe mode, went to last known good configuration. sfc /scannow worked, no errors found, sil the system BSOD later while browsing through forums. BSOD seem random now. BSOD message is always page file non paged area with the 0x0000005 error code, and the windows message on startup points to error 1033. WinDbg points to the ntkrpamp.exe, here is the last dump analysis: Microsoft (R) Windows Debugger Version 6.10.0003.233 X86 Copyright (c) Microsoft Corporation. All rights reserved. --------- This got this BSOD while running Verifier on custom settings: Special pool, Pool tracker, Forced IRQL Checking Realy hope someone can help me with this as i have no idea what to do next.. ps. ran MemTest about 15 passes, no RAM errors. tryed to switch to onboard soundcard, no difference, even same sound errors in the games. I can provide any additional info you require. Thank you. Update: Most recent BSOD, 5 minutes ago, while installing software: Microsoft (R) Windows Debugger Version 6.10.0003.233 X86 Copyright (c) Microsoft Corporation. All rights reserved. Update: Also had one BSOD in Safe Mode pointing to explorer.exe, i'm looking for that dmp file now. Attached last 8 minidump files. Also, divers are all updated, mostly from dell website, except for chipset and video, downloaded from nvidia website, latest release.