Directshow Issue

[J7N]

You don't need to install Media Player 7, 8, 9, 10 or 11. They will only add bloated GUI and ASF license restrictions. If it is directshow core you need, then install Media Player 6.4 (was it mpieful4.exe?). It used to be bundled with older videogames and demo discs [years 1999-2000].

After another user installed new WMP on my other machine and I uninstalled it afterwards, WMA files could no longer be played and returned a license-related error.

I think that registry editing won't solve this problem. Error-messages like this appear if conflicting system components are installed (like msdxm.ocx from WinNT(XP) and quartz.dll from Win98). The first thing I would do would be shutting down all processes including, but not limited to, antivirus. Then I would overwrite all system files with the ones provided in MP6.4 package.