There problem seems to be caused by the your re-installation. You should delete the DRM folder and re-individualize your system (Please note that you will lose all the licenses. However you should re-download them anyway.)

Related links:
Windows Media Player 10/11: How to determine IBX version
unDRM.info FAQ: Windows Media Player Individualization Process.

p.s. DRM removal software is intended to be used on LEGALLY purchased files only. Please do not abuse rental licenses.