I was constantly getting that error with my MX4000 card. I updated the drivers, followed these suggestions and no longer get the BSOD.
http://www.tweakguides.com/NVFORCE_4.htmlQUOTE
Disable Nvidia Services
When the Forceware drivers install on your system, they install a new Service called the 'Nvidia Display Driver Service'. In general this service doesn't have any essential functionality. In my experience, most people can safely disable this service and not run into any difficulties or reduced functionality whatsoever. In fact some users note that disabling this service improves Windows startup and shutdown times and general performance, so I suggest you disable this service. To disable it go to Start>Run and type "Services.msc" (without quotes). This opens the Windows XP Services utility. Double-click on the 'Nvidia Display Driver Service' and select the Disable option under the 'Startup Type' box, then click OK. Disabled services are removed from memory after the next reboot.
Note that some people report potential issues with temperature monitoring on their graphics cards if this service is disabled, so check your temperatures often and reenable this service (set it back to Automatic) if your card usually runs extremely hot, or if you feel you are experiencing any other strange behavior due to the disabling of this service. Once again though, most users should be perfectly fine with this service disabled.
Remove Nvidia Startup Items
By default the Forceware drivers also install three new startup items in your Windows Startup list: NvCplDaemon, NvMediaCenter (also called NvMcTray) and Nwiz. Depending on the functionality you use in the Forceware drivers you can remove some or all of these from your Windows startup, speeding up startup times and reducing background memory usage. The NvCplDaemon item relates to the Nvidia System Tray icon and related functionality. If you don't use the System Tray icon to access the Forceware Control Panel settings - and I recommend you don't - then you can remove this item. Note however that if you overclocking your graphics card using the Forceware Control Panel (See the Overclocking section) then you need to keep this item in your startup. The NvMediaCenter item relates to certain Multimedia functionality in the Nvidia System Tray icon and once again it is recommended you disable this item as well. However if you find particular games (e.g. Everquest) don't function correctly with this disabled, re-enable it. The Nwiz item relates to nView functionality (See the nView Desktop Manager section), and unless you use nView you can safely disable it. To remove any of these items from your Windows startup correctly you should refer to the Startup Programs chapter of my TweakGuides Tweaking Companion for full details.