Multi Region Portable Dvd With Dual Screens DVD Region Codes - How Does It Affect The DVD Play?

DVD region codes - how does it affect the DVD play? - multi region portable dvd with dual screens

Hello
I bought an Acer laptop in Singapore and DVDs, she played in India, which has worked well.
I recently bought a DVD in the United States to play on my laptop, but somehow takes every second, so there is a stain on the floor and movement while.

I thought if it is not a problem with a regional code to play. Is that bad? If the problem is to allow a region code of DVD playback, but the quality of these changes?
Region I tried the same DVD on my portable DVD player is multi-and works well, it's not a bug in DVD!
Ideas?