Trying to eliminate machine crashing, I have seen numerous BSOD, first, was spooldv.sys caused shut down, possible malware. Second, win32K.sys error suggests bad driver, replace graphics card, nothing specific on which driver was causing error. Third, Page fault in non-paged area. fourth error caused by es1371mp.sys. Also, recently have had difficulty with Windows Update, getting error 800704DD. Edited registry as suggested ...no help. The crash will occur most frequently while beginning a download. But also occurs when running virus scanner. Microsoft MSRT will almost always cause crash as will most scanning tools, unless they come back clean. The Malwarebytes Anti-Malware crashed immediately. (No log submitted.) SAS did not run clean on first attempt. System history, I had trouble before and did a complete reinstall and upgraded to SP3, added a wireless connection via Netgear's Rangemax Dual Band Wireless-N USB Adapter and added NEC PCI USB 2.0 card. I am running AVG8 Internet Security with Firewall. Am thinking all this could be malware and would like to confirm that before I move onto hardware issues. Thanks.