How to uninstall a plugin from Eclipse Galileo 3.5?

I have eclipse G开发者_高级运维alileo 3.5 with maven plugin installed. I want to know if there is any way to uninstall that plugin. I do not see any option as uninstall a plugin in this version if eclipse.

The following is the screen i got after reading one of the comments on this question. but the uninstall button is disabled. What to do?

Thanks in advance.

Ok, I got the problem (and obviously solved it). The problem was I was using IDM as a download manager which used to take over any downloads by eclipse. So i disabled Eclipse from the IDM options and then the maven jars were downloaded where they actually belong to. Problem solved :)