SVN not working in Eclipse

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 a project that I used with SVN the whole submenu of "Team" and the little icons that showed that some files weren't commited, they all dissapeared.

I tried everything:

• revert from Instalation History tab
• uninstall from Installed Software tab
• replaced the folder eclipse in Program Files with a new one downloaded from eclipse website and tried to install again
• searched how to install it on the net

But in none of the cases above if I press Ctrl+N There is no SVN group; If i right click on a project and select Team -> Share project, a window with CVS appears, but no SVN. If I choose File -> Import I can't find SVN anywhere.

If I go to Help -> About Eclipse -> Instalation details I see at Instalation History in 25.06.2009, 09:59:08 GMT+03:00 (when SVN worked)

Eclipse IDE for Java EE Developers  1.2.0.20090621-0820
Subclipse (Required)    1.6.2
Subversion JavaHL Native Library Adapter (Required) 1.6.3
SVNKit Library  1.3.0.5847

In the Installed Software tab I have now installed

Eclipse IDE for Java EE Developers  1.2.0.20090621-0820 epp.package.jee
Subclipse (Required)    1.6.5   org.tigris.subversion.subclipse.feature.group
Subversion JavaHL Native Library Adapter (Required) 1.6.6   org.tigris.subversion.clientadapter.javahl.feature.feature.group
SVNKit Library  1.3.1.6109  org.tmatesoft.svnkit.feature.group

How can I make SVN to work?
Where does eclipse store its files, because when I changed the eclipse directory with a new one all my stuff was there (the ones that I installed