eclipse plugins not visible

I have recently installed gwt-plugin to my eclipse. But plugins are are not visible, even if I try to install it again, eclipse is not allowing me to install, saying its already installed.I even I ran eclipse as administrator(I am using it in win开发者_开发技巧dows 7) and also with clean option, nothing worked out.

And one more thing, After GWT installation, it gave two options - 'Restart' and 'Apply changes'.I have chosen 'Restart'. (Does it matter?)

Any help is appreciated..

Maybe you installed gwt-plugin correctly, but you are missing one of its dependencies? Take a look at this thread. One of the answers discusses using the OSGI console to locate missing dependencies.