Songs From K-lite Skipping And Jogging

hi,

recently iv been getting songs from k-lite and they seem to come pre-skipped!

you know when you get a cd and play it, jog it and it skips around back and forward slightly, can also happen when you play music on your pc and your pc is running really slow and it doesnt play it smoothly

well the songs i have downloaded, popular ones, instead of being all screechy, they skip

any ideas?????

mike