Hello. I was wondering if anyone has any idea of this particular problem I've been having for some time now: After a fresh installation of WinXP (Build 2600) and ServicePack 2, everything works fine for a few days. (I can install all the necesary hardware drivers and applications I'm going to use) After that, everytime I install ANY software that installs its own driver, or modifies any driver/file inside the windows folder, I get the STOP ERROR: Page Fault in nonpaged Area immediately after windows boots up. Its so ridiculous, that las night, I installed the lates version of windows messenger (Live messenger) and I restarted the PC just to check, and there it was; the same error. So I can't install ANYTHING that just slightly modifies a windows drive without getting this error. The only solutions I have found are: Running system recovery in safe mode (Which removed the app I just installed, so its not a good one), and booting up in safe mode, and Re-installing ServicePack 2 over the installation I already had. (I have to re-install service pack 2 now, after every application I install, in order to keep it) My guess is that when I reinstall SP2, it overwrites the modified files to thier original form, and thus windows can boot up. But this can't be normal, how can windows be so sensible to a few file/driver changes? Is my version of windows the culprit? I have been getting this same error with my last 2 PCs (and have installed the same version of windows and SP2 on both) I don't think its a hardware problem, since my current PC is Brand New: Asus A8N32-SLI Deluxe Motherboard Athlon 64 4400+ X2 Corsair TWINX2048-3200C2 2GB DDR400 eVGA e-GeForce 7900 GT KO PCI Express 256MB Seagate Barracuda 7200.9 ST3300622A 300GB Antec TruePower 2.0 TP-II 550 550W PSU Sould Blaster Audigy 7.1 And I had the exact same proble with my old PC which had totally different hardware (Nothing was recycled to my current PC) Any Ideas? By reinstalling SP2 over and over, am I corrupting newer drivers used by sound/ video card? What can I do to pinpoint the problem? Thanks!