get isomaker 2.0 -
TDK DVD-r are fantastic discs to use - or Verbatim DVD-r.
Strange that the discs work on your friends box but not yours.
I use the krayzie installer with splinter cell and all the games I burn work great for mine and my mates boxes.
Try buying a few single different brand discs and give them a try.
If the games work on your friends box , They should work on yours with no problems.
Can you play retail games from the DVD/CD drive?