How do I remove bukkit from my computer completely?

My Buddy is having some problems with his server so I thought I would come here to help him out.

1.His servers use to crash due to the mods he downloaded from bukkit making it so we had to restart are servers more then once.

2.He says he has removed bukkit but still his server can not be hosted unless bukkit updates the new patch came out and my internet is not strong enough to run a server so he has to run the server only problem is he can't host due to bukkit and it having something still on his pc that will not let him host it unless bukkit updates.

So, the question is How to remove the entire program and any hidden files stopping him from hosting his server?

 

Err.

Bucket doesn't 'INSTALL' anything in the traditional windows sense. If you remove the craftbukkit .jar file, its gone. It is uninstalled. There are no hidden files.

 

Ty for your help I think he got it fixed.

 

I have a similar problem. I had a sever and i wanted to be able to download /sethome, /back, etc. so i added it to my server only to realize that it completely re-started my server. I still have the server saved so I have everything I need to get it back to how it was. The problem is it keeps starting a new server. Is there a way to keep bukkit and get my old server back or is there a way to completely get rid of bukkit? I tried looking for craftbukkit.jar but im on a imac and i cant find it. Anyway to get rid of it or get my old server back? Thanks