Hello, You might be having a problem with your cpu being bogged down and having a problem processing the dvd video. Start by maybe removing or deleteing programs you no longer use. This will hopefully free up some of you computers resources. Bottom line you computer could possibly be working to hard on other things. So anything that frees up cpu power will help. Shutting down other programs before playing a movie will help also.
Hope this helps

If it is your cd-dvd rom, or your dvd's, your movies would skip, freeze, like any other movies players such as a scratch dvd played on your home dvd player. So,
did this happen before any updates to your o/s, such if you are using windows media player to play your movies?? If not, it could be a software issue, where some updates will bring your programs up to date, but uses more cpu/memory and even your GPU (graphic processor) and thus cause your movies or video to play back slowly because your computer hardware is underpower to handle the up to date versions., or it could be vise versa where your program will needs an update to the newest version to play. (Usually like adobe, java to watch youtube or online videos). You might want to see if you can play with another program and see if you get different result, or maybe undo your update to previous version.