Hi zeaenarion, when screws lose their shape like that we call them stripped.
The proper driver for those screws should be Phillips #00, not #0, so trying that might help. Otherwise, take a look at this list of [http://www.todayifoundout.com/index.php/2010/02/the-12-best-ways-to-remove-stripped-screws/|the 12 best ways to remove stripped screws], to see if anything there can help.
If none of those work, iFixit also has a [product|IF145-118|Precision Screw Extraction Kit] that should be able to get those out for you.