New
#1051
On XP in particular without having the NetFramework 2.0 version installed the older catalysts would run into the "MOM Implementation" error until that was downloaded and installed followed by a fresh reinstall of the catalyst version you were using.
Typically you saw that only after a fresh or recent install of the older version and not having all updates on. Typically that came up during a gaming session where the error message followed a game crash.
As for having an onboard ATI chip that should be disabled in the Device Manager as well as the bios setting change to PCI/PCIe when drivers only are present when running a separate NVidia card. That will keep the updates from continuing to search for newer ATI integrated versions while having NVidia in use.
As for ATI using NVidia or NVidia using anything ATI the simple answer Brink provided is the exact same either way. NO! ATI wares are written specific for ATI chips while NVidia is written for NVidia chips. That would be like trying to run a Core 2 duo on an old Socket A board. "Total Mismatch"