rar to iso?
 

Is there any program that will convert .rar files to .iso. And is there anything i need to know about converting them?

I don't know of any way to do it directly, but you can just extract the contents of the rar (using unrar), and then make yourself an iso file from the contents (using for example mkisofs).

Really though they're two different things, rars are compressed archives, and iso's are a disc image. What's in the rar you want to convert? And why do you want it as an iso.