How to Fix Terminal in Ubuntu?

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http://askubuntu.com – I'm stuck. Ubuntu 11.10 was working fine. I tried to create a desktop icon that I could click and run a Terminal command. (not launch a program, just run a command to set something). I don't know what I did, but now I can't get Terminal to run at all. I can't click on Terminal in the Launchbar or use alt-F2. If I try, I see a VERY quick box open and close. If I switch to another user, Terminal does open and work fine? I can't even get it to open gconfig or x-term or x-term manager? Does anyone know how to reset Terminal without being able to get into Terminal? I tried going into synaptic and r (HowTos)