Ask your tech department to check the drivers, chances are its a driver problem... Tech departments are often useless, though, from what I hear.
First: Check your program settings and preferences, just as a quick safety to make sure its none of those things (but it doesnt sound like it is, so don't look too hard - most mediaplayers dont allow you to change the speed at which a file plays).
Second: Go into your hardware list, and make sure you don't have any media hardware devices conflicting. A conflict is usually indicated by a red highlight and/or one of those ! yellow exclamation signs. If it has one of those, find the detailed information and see what is in conflict - usually its drivers.
Third: Check to see if you have the most updated driver for you soundcard and video cards - but especially your soundcard. Sometimes it won't say theres a conflict, but, really... there still can be. More often then not, its a driver issue - your soundcard manufacturer will have an online list of driver updates that you can download and install.
If none of those work, then I'm really not sure what to tell you without more information.
In either case, RAM generally shouldnt influence the speed at which a peice of hardware works... I'm not going to count that out, but I really cant think of any reason why RAM would effect audio speed and not video speed - since the nature of RAM is to cache data for immediate and immediate impending use; lack of RAM tends to make things slow down rather than speed up. That being said, this is why Im fairly certain that its hardware and hardware-driver related.
Hopefully thats of some help. If its none of those things, I'm really not sure what to say, without actually looking at it myself.