i was talking about lindows, its a free OS, and yes you can take the files in the .rar, what kind of files are in the rar file? If they are iso, or bin and cue, then you can burn them through nero, you just open them through nero and it will automatically put them in the burn list and you can burn them, there for, creating the game CD.
BTW, what game are you trying to boot from? Sounds like it could be interesting, or old, lol!