Well i'm so puzzled...
Here's my system :
It seems that since i'm on Seven, i can install ArmA2 BUT i can't apply any patch without geting a freeze (the "famous" bluish vertical lines and PC freeze from ATI series 5). I got crash with my previous card too (HD4870x2) when applying the latest patch 1.55. And so i can't install OA neither as it tries to install 1.06 patch, then freezes.i7920 not OC (HT off)
Brand new HD 5870 from Asus
Windows 7 64 (upgrade from Vista64), Dx11
Any ideas before i throw my comp out of the window (seven...).