Check your video card. Through my experience I have found that you need at least a 16 meg video card for the words to sweep correctly. Anything less and the words and sweep lag way behind the music. I'm currently using an inexpensive ($35-$40) 32meg
video card which works great!
P.S. Stay away from any S3 cards.
P.P.S. Check some of the other posts in this forum. This topic has been covered quite extensively.
Larry T.