You can use winrar or alcohol as mentioned or even hjsplit to make the iso into cd sized bite then rejoin them on your friends pc and use daemon tools to install. Or you can join one of the conversion sites/forums like I did.
Here some of the members have the talent to re-write msi install files and they share them for others to make backups of their original games. Notice I said original games so don't go posting your going to make copies for your friends or you will get no help.
Search your specific game titles or on the cd-2-dvd site, if you join you can also go to the forum and about 4 listings down is the help finding conversions pages where you can browse or search for your game. If your really nice and they don't suspect your pirating, you might get someone to help you with files not already done, so be diplomatic if you request a fix.
They do cd's to dvd, dvd9 to 2xdvd5 as well as dvd back to cd's which is what you need. When a game is only 2gig its more likely you'll find a fix to get back to cd's cause its a waste of space to use a dvd to back up so there's a good chance there's something there.
I could get stuff for you but you may need this again so its best you register.
Read this page to the bottom and you'll see what I'm talking about: