Eaglefox,
By saying you are running "NVIDIA uninstaller" im assuming you mean for your video card..due to the fact I am not aware of NVDIA having a stand alone software for anything.
If this is the case you should be able to download the 64 bit video card drivers form thier site ..
Once you do this and run the install file, there is a an option during installation that says someting to effect of "do a clean instal" make sure that option is activated(check marked).
What that will do in uninstall your previous drivers(if any), and reinstall the drivers you want it to install.
Other than that what you COULD do is download the version you have now(32 bit) and if the option is available .. choose to remove those drivers .. reboot your system, and reinstall with the 64bit version which you should download anyway .
Again this is assuming you are speaking of NVIDIA ..VIDEO CARD Drivers.
Hope that helps.
LoneWolf
Edited to add .. Opps wheres my manners .. Welcome to Windows 7 Forums.