You are using a good brand of media. Other good brands include Verbatim, Taiyo-Yuden, and Hitachi-Maxell. (Buy whatever's on sale!) By the way, I only use DVDRWs for temporary files...they are a lot more expensive than DVDRs. If it's a movie you want to keep, I would stick with DVDR, although DVDRWs are good for practicing on! Just something else to check...what disks will your DVD player accept? I would make sure that it will play DVDRW.
Good Luck
Dano
P.S. I don't know if this will help, but I used to have problems with movie conversion programs crashing. I eventually discovered that it was a CODEC PACK that was screwing everything up! If you have one of these installed, you may want to try uninstalling it. Then, just download the DivX and XviD codecs from their respective websites. I use a program called AVICodec (free) that will identify which codecs I need for movies, although 99% are DivX or XviD (I only download .avi files).