You may have compiled the program as root, so the folder itself can be moved but files inside of it cannot be deleted from the desktop. Go into the shell and use the command rm -rf <folder-to-delete>
as the root user.
You don't need to be root for the ./configure and make steps. Just the 'make install' step.
also, how does compiling work? once i compile it, can i save the folder and reuse it on another computer using the same OS? thanks.
Yes, but it would be more convenient to copy the source tarball instead.
I'll make backups of the tar-ball sources when I backup all of my downloads. Doing this, you could grab the CD and install it on whatever linux host you wanted to, or re-install if you needed to.