This is one of the more common symptoms of a problem with the nVidia driver set, particularly if you installed the nVidia firewall. Visit the nVidia mobo forum for more info, although it may take a while to poke through all the complaints to find those matching yours:
http://forums.nvidia.com/index.php?s=f3...ead353326152f9b12af806c46&showforum=34
Sometimes (unpredictably) replacing the nVidia drivers in the normal way leads to BSODs, especially with earlier releases like 6.39 (and often 6.53). The installer is improving with each release so try the 7.13 Intel release on your VNF4 -- I'm running 7.12 Intel Beta on my VNF4 (normal install, 6.53 required a clean install) and it works but has the same "issues" that occurred with 6.53 on my machine. The random nature of the problems with the drivers is peculiar in that when a system has difficulty it generally has difficulty with all releases although occasionally installing a new release will fix things (so I keep trying the new releases).
If you still have problems after a normal install of 7.13, you may have to do a clean install of XP followed immediately by the nVidia drivers (6.53 or 7.13). Installation of the nVidia drivers remains a crapshoot, where a clean install has the best chance of success. There is a good description of the procedure by an owner who has done it successfully:
http://forums.nvidia.com/index.php?showtopic=5146
The most common nVidia driver problems seem to concern NAM -- if you leave it out your probability of success will improve; the 6.53 and 7.1* releases make this easy. Also, consider not including the nVidia IDE driver simply because of the number of owners who seem to think it causes problems; the default XP drivers seem to work fine.
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