If it worked before it should work after a reinstall. Did you do a complete uninstallation? Did you delete everything from your initial install?
A clean install will work, if the game was working before. There's nothing in your GPU, if it works, that would cause one game installation to work and a new installation not to work.
Something's wrong with your installation procedure.
Try this:
- Uninstall the game, using the control panel routine.
- Check the game directories to see if they are empty. If not, manually delete all files. You can leave your \MODS directory if you want
- Install the base game. Does it run?
- Install the 1.4 patch (you don't need to install all the patches. 1.4 includes all previous patches.
- Your game should run. If not, there's something wrong with the 1.4 patch. Redownload from the Ubi site.