HD 5850

With 13.1 installed, I have "lag" problems @FIFA 13 that I didn't have with older driver versions. So I completely removed the driver and installed 12.10, but then I get the error "Load MMdriver Application funktioniert nicht mehr"/stopped working. The same problem happens when I install 12.8.. Control Center etc. also crashes.

"Problemsignatur:
  Problemereignisname:    APPCRASH
  Anwendungsname:    MMLoadDrv.exe
  Anwendungsversion:    2.0.0.0
  Anwendungszeitstempel:    5065f9d3
  Fehlermodulname:    StackHash_f87c
  Fehlermodulversion:    6.1.7601.17725
  Fehlermodulzeitstempel:    4ec49b8f
  Ausnahmecode:    c0000374
  Ausnahmeoffset:    000ce6c3
  Betriebsystemversion:    6.1.7601.2.1.0.768.3
  Gebietsschema-ID:    1031
  Zusatzinformation 1:    f87c
  Zusatzinformation 2:    f87c77962d001f571494c9831bb335a8
  Zusatzinformation 3:    06a3
  Zusatzinformation 4:    06a35333e7ab775a28725c6548fe20e3 "

When I install 13.1 everything works fine, except the "lag" problem at FIFA 13.

I don't understand why I have those problems trying to install older driver versions - I had them intalled previously and hat no problems.. but now..?

Is there away to get the "old" versions working again?

I'm having exact same issue! After installing 13.x driver I can no longer go back to older drivers because MMloadDrv.exe followed by CCC will both crash immediately after I log on to windows:-(

So have you fixed your problem friend?