I currently have redhat on my computer, is it possible to install XP and use this program. I was it is hard to install XP after linux is installed.
You should be able to, but you should hide the redhat partition before starting the install.
see thread "Tip: Avoiding Unbootable Partitions" this applies to your situation (and others)
if you don't already have empty disk partitions for the additional installs...
you will have to defrag and resize your existing install to make room for additonal partitions. GHOST and another disk would make this a piece of cake. GHOST your Redhat to disk #2. Partition disk #1 and GHOST Redhat from #2 back into a new partition on #1. (Don't know if GAG has partition resize or move features.)