Well, I'm not 100% sure on this, but I think you just may have deleted the reference to where urpmi installs it's programs from. Try doing this before considering reinstalling
go to this site
http://urpmi.org/easyurpmi/index.php. Pick what mirrors are closest to you and click on proceed. This will give you four commands to type in
go through those commands and see if they restore your urpmi. If it doesn't work, I dunno man. Sorry
Good luck
