With the variety of computers (hardware, operating systems, etc.), it would be helpful if you could give a snapshot of your environment here.
- Operating System, including service packs
- Processor (Intel/AMD, speed, dual, etc)
- RAM Memory
- Video card
- Audio card
- CD/DVD Drive type (make & model)
Also, if one particular type of file is giving you fits, let MTU know this as well. For example, CDCDG files work fine, but HDMP3G and HDZIP files fail. All of this information will help guide MTU in the determination of the problem(s).