3.5 WordPress doesn't work

Yesterday I’ve updated my wordpress to 3.5 and siince then I can’t add any photos to my posts because the window which shows when I click on upload file doesn’t work. I can’t even close it.
What should I do?? I read I should deactivate all plugins but it didn’t help. I don’t wantt to delete anything.

Or is there any easy way how to get back older version?? 🙁