skipping videos on data DVD-Rs

I just recently have been having a problem with my burned data DVD-Rs.  Every time I go to watch a movie (wmv, avi, etc) the audio is heavily skipping.  Mind you, it's EVERY DVD-R I own.  Even ones that I had burned a few months ago that used to work are crapping out on me.

I can copy the videos to my laptop, but it's a little laggy and slows the whole system.  Files I play off the harddrive are ok and have no problems.

My CPU Usage when I view the movies is at 7%, so I don't think it's a memory problem. 

My laptop is fairly new - bought it last October.

Other than a DVD drive issue, is there a possibility there could be another problem?

Stats are: Gateway 7500 Notebook, AMD Athlon 64, 4000+ Processor, 775 MHz, 1 GB RAM
DVD drive: HL-DT-ST DVD-RW GCA-4080N

any help would be GREATLY appreciated.

Try them on another computer... if they work fine then your drive, or its connection to the computer is fucked, cause if they work fine from the HDD then it's not a software problem.

actually, thanks for the reply - but i just managed to fix it.

i had to reset the settings for the DVD drive back to DMA mode.  it had been switched to PIO.