CompuServe Messages

I've been trying Wolfenstein on my 386sx bboard. However, there seems to bve some memory corruption problems. It looks as tho part of the video mem is being troden on by something and I'm not clued up enuf to know how or what to do to fix it. What happens is this. The basic screen opens and a meeage at the bottom of the screen saus 'Please wait a moment'. A few seconds later this message gets overwritten by yellow vertical lines. Next press any key and that screen becomes a mess of mauve coloured vertical full screen height lines. Pressing the return key a few times cycles through some screens which appear to be just screen grabs; these don't get messed up. The start screen which says 'Get Physced' (sp?) then displays a variety of boxes at the bottom all of which are unreadable. The basic game play is fine with no screen coruption, it is just part which report progress which get screwed. Has anyone any ideas what to do please? Pete Pete From Dorset in Englands westcountry