I don't know if this will help, but I believe that the btwincap drivers have an option at the beginning of the setup to remove any current drivers. If you can, do that without installing the btwincap ...

i just installed a Leadtek WinFast Mx64 (GF2 MX200) in a friends system as an 'upgrade' (not much of one!) to his TNT2...<P>everything was fubar-ed... (ie: win2k no longer started) after attempting ...