I had troubles with some driver updates from MS update for AC'97 sound cards that caused those problems.
Originally Posted by Ant1981
I also had problems for awhile with some drivers for my ATI graphics card. I had to update them to get them to work.
Some aircraft also require additional files to be installed to get them to work correctly. Typically those files go into the modules folder. There is one I remember that I had to move to my system or system32 folder so that FS9 and FSX aircraft could use it, but I cannot remember that file name. I think it was for sound, I am not sure. Someone out there may remember it. Typically the instructions for the aircraft will include information about that file. I ran a utility that had deleted that file in FS9 and as it detected a copy in FSX, which forced me to move it to the system/system32 folder.
Hope this helps.
Home built desktop: 1.8 gig AMD Athlon XP 2200+ processor, Biostar M7VIT Pro motherboard, 3 gig ram, HIS ATI 4670 8x AGP video card with 1 gig of video ram.
Netbook: Toshiba NB205