This question is a result of the issue stated in this SU-question. Please read it beforehand.
I have upgraded my OS from Windows Vista Home Premium x64 to Windows 7 Home Premium x64. It's a legal upgrade. Upgrade was successful except one problem: Windows 7 does not recognize the Media Card Reader of my desktop PC anymore. When I open the Device Manager, nothing seems wrong. Before the upgrade, K, L, M, etc. drives were active as Media Card Reader drives. Now they are not present.
Is there any way to make Win7 recognize this device? Or do I have to make a clean install as a desperate remedy?