Ldray hath wroth:
The DWL-520 comes in 5 different hardware versions: A, B, C1, D1, and E1. If you download and install the wrong driver, it won't work. Go to the support page at:
Go to Control Panel -> Add Remove Software and vaporize anything you've installed. Then try installing the driver again.
Yes, that will work. It usually does a fair job of putting things back the way they were. However, I save it for a last resort because of ocassional unintended suprises. If you've done a Windoze Update or Office Update between the restore point and today, you might have to reinstall some updates.