Well I can think of two problems.
First, in Alchohol, are yuo using the 'playstation' setting when burning? If not, that might be it.
Another might be the resolution. If it's skipping you may be playing a PAL game instead of an NTSC game. You shuold be able to change the settings to fix that. I don't know how to do it right now, I'll edit my post when I get home.