Possible Duplicate:
uninstall plugins in Eclipse 3.4.X
How to uninstall a plugin in eclipse?
Click Help > About and then click Installation Details
Select the Plugin you installed and then click uninstall
Thats all
Its uninstalled
"Help" -> "About Eclipse" -> "Installation Details" -> (select a plugin)"Uninstall"
Use the menu option: Help > About, then Installation Details
Find the desired Plugin click uninstall
Restart your workspace and run it using the clean flag: eclipse.exe -clean
That's it.