I've attached two files that I used with my old mouse on Vista x64. They should still work on Windows 7 x64, too, though I haven't tried it as my Logitech G5 can increase the polling rate within its software.
Run the setup.exe for hidusbf and follow the instructions in the readme file that comes with it. Once you have increased that, run mouserate and move your mouse around in the program and it'll tell you your USB polling rate so you can check it has properly been increased.
Edit: If it doesn't work in Windows 7 x64, you might have to disable signed driver enforcing.