Are you following the proper uninstall/reinstall suggestions? It causes alot of issues if you don't do it right (as outlined here:
http://www.notebookforums.com/thread204407.html)
None of the 4 XPS M1710's that I have contact with and test/use MobileForce (or just modded vanilla ForceWare, for that matter) drivers have that problem with the BSOD's at all, and never have (2 with 7950 GTXs, 1 7900 GS, 1 7900 GTX) so its pretty much impossible for me to duplicate and try and find a solution to.
What I said above is about all I can suggest, other than using the stock Dell drivers.