Lock-Up problem

[B-DUB]

My FS2002 locks up everytime I try to play it. At lower flight levels, it will run for about 10 minutes and then lock up. At flight levels such as 30,000ft., it'll lock up in about 45 minutes. When this happens, an error comes up. One of the errors said, "A Fatal Exception OE has occured 0028:FF0AA06E in VXD KMIXER(o1)+0000028E. I have no idea what this means. This is really starting to bother me. Has this happened to anyone else, and does anyone know how to fix this problem? Thanks in advance.
Comp. Specs. 1.1GHz. /248MB memory/ NVidia MX420