Media player 11 and usb

[wizard032]

I need help I have a Hp pavillion laptop and my media player 11 nolonger recongnizes any of my flash drives . It use to see them now it does not .I have tried system restore but it does not help. It happend after i installed a drm converter and then removed it. I lost my dvd player and had to fix it through the registry . II did not see my flash drives or my 400 gig usb drive before i went to the registry and removed upper filters which fixed my cd/dvd problem