See if this helps :
1. Go to Start, Run
2. Type in: regedit then click OK
3. Navigate to: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Contro l\Class\ {4D36E965-E325-11CE-BFC1-08002BE10318}
4. Look in right pane and find the Upper Filter and Lower Filter entries.
5. Right click on each and select Delete.
6. Close regedit and reboot