Well, in DOS it's just DEL .. or DEL Tree or something like that. And yes, you can just use help, it's not that hard...
You can just go to add/remove programs.
Or with most programs you can just go to the program files, open up the folder of the program and look around in there. There should be an UNINSTALL or UNIST or something to that effect... but again what Atomic said, you still have to delete it out of the registry if you just delete the files. All DOS is going to do is delete the files, you can just delete the folder out of your program files and it will have the same effect.
run regedit and it will be under Hkey.. um.. localmachine then software. I'm not looking at it so I may be wrong but I'm pretty sure that's right.
Good luck. And don't go deleting stuff you don't know what is in the registry.
-Q