on 07-06-2011 09:25
on 07-06-2011 09:33
on 07-06-2011 11:08
If you're really desperate try a factory reset (but this will delete all of your data).
Alternatively try a firmware update via the Kies utility. Android 2.3 is now available (I recently upgraded a friend's Galaxy S).
Unfortunately I cannot be responsible if you brick your phone by following these suggestions!!!!!!