Bad Driver

Hi. I just installed the mugen xp too. It works great! However, after I exited (as in back to MWC), I got lots of horizontal lines which I can't get rid of unless I restart my computer. These lines mess up everything on the screen and I can't read anything on my screen anymore, leaving me no choice but to restart. Anybody else has this problem? Any ideas for a solution? I like Mugen but I'm not going to restart everytime I wanna stop playing. Any help would be appreciated! I'm using a laptop, btw, so that might be a factor. My specs: P4 2.40GHz 448MB of RAM RADEON IGP 345M Sound is fine.