Hypernight, you can try Driver Sweeper as mentioned above. Make a restore point before you do so.
1. Remove the driver.
2. Got to safe mode Desktop, and run driver sweeper.
3. Remove the USB dongle entries.
4. Run CCleaner to clean registry entries.
5. Reboot to normal mode.
6. Install Driver.
7. Restart+verify.
I doubt this will fix your issue. You can try. It seems more likely your USB device is not suited for Win7.
1. Remove the driver.
2. Got to safe mode Desktop, and run driver sweeper.
3. Remove the USB dongle entries.
4. Run CCleaner to clean registry entries.
5. Reboot to normal mode.
6. Install Driver.
7. Restart+verify.
I doubt this will fix your issue. You can try. It seems more likely your USB device is not suited for Win7.