@xzoron I would download Revo uninstaller then run it to completely remove Opera. Revo gets rid of stuff in the Registry and other locations, in addition to simply removing the program. Then try reinstalling Opera.
I was having trouble getting Opera to log into my bank from my laptop, even though it worked fine on my Desktop with same OS, Opera version, etc. After I completely removed Opera with Revo then reinstalled Opera, everything worked fine.
When you use Revo be sure to run the added crap remover option to completely remove all traces of Opera before reinstalling