One day I pressed in Eclipse Help -> Check for Updates (and I learnt that I should Never Ever update a software which works fine.)
Then in
Subversive is my favorite SVN implementation in Eclipse because it works better than the others and it integrates neatly into the UI.
I suggest you follow these steps:
workspace in your user directory)Help, then Install New Software...http://download.eclipse.org/releases/galileoIf you aren't prompted to install a connector, you can always do so from the preferences screen:

If the above doesn't work for you, it seems that your workspace isn't cleaned out. Locate your default workspace and try getting things working without any projects before you continue.
You could then also try deleting the .eclipse directory in your user directory. And starting over from step 3.