Don't give it up so easy...PC components are meant to drive you to a nervous breakdown.
First try updating the firmware to the latest version from the Msi site
Release new F/W version: 160D
1. Enhance Read/Write performance.
2. Enhance DVD?R/RW media compatibility to support more discs on the market
Looking at the reviews for the media you are using,it is not the best in the world but neither the worst.
Do you have any other re-writeable media of a different brand to try to see whether it is the media causing problems
Eliminating all possible causes can be time consuming but also acts a knowledge base for others when problems are solved.
I have been using this program as well as dvddecrypter for a long time and after installing the latest version suffered from the same slow down,buffer problem that others have already stated,but no way would I give up using it because it wasnt working at 110% efficiency,but wouldrather wait for the fix that I'm sure is coming.