Sansui VRDVD4000 format
I do not believe this player plays AVI videos, not to mention whatever codec you are trying to use.
Download VSO ConvertXtoDVD and convert your AVI files to DVD and then burn them to DVD-R (NOT DVD+R), the 4.7GB discs (single-layer).
This process takes a very long time, depending on the size of the movies you are converting, some 1-2 hours, some 8-24 hours.
I suggest buying a Philips DVD Player that plays DivX and XviD AVI files, they seem to be the best. You can just burn the AVI to any disc and it will play. [Most popular seems to be Philips DVP 642]