Welcome to the linux world!

It takes some patience and willingness to learn to run and resolve (problems with) open source.

AFAIK you should not be getting a prompt like that if you are in linux. I think you're in DOS.
Caldera is no longer supported and there are other issues with that defunct distro too.

You might want to try a live cd distro like knoppix, gnoppix, or dyne:bolic. There are others as well. Check out www.distrowatch.com

I don't use aol but yes you can run aim in linux. Here is a link: http://www.aim.com/get_aim/linux/latest_linux.adp?aolp=