FIXED FOR NOW!!!!!!!!!!!!!!! Thanks to Monticello
Until Beth or Nvidia get there act together and get it fixed with drivers1) Download http://rapidshare.com/files/160642187/FPS_Limiter_0.2.rar
2) Download the latest java and install
3) Unpack the limiter to any dir
4) Download the dx9.dll from the following link ( just the download link NOT the advert banners ) , the file is virus clean. Copy the dll into your fallout vegas root directory
http://www.megaupload.com/?d=6LHPT9ZC
5) Run the fps_limiter GUI , select 50FPS or 55FPS , the name and the path of the main game exe. Create Bat
6) Go into your falloutprefs and fallout ini file in documents/my games take off the read only option. Edit the option IFPSCLAMP=50 or 55 depending on your choice!. Then make sure read only is ticked again.
7) Now the downside , because the exe is encryped you will need the NOCD this i cannot help you with. You could try Gam*copyworld