yesterday I found that BF2142 has issues with NGO's 7.3; reverted to original catalyst and all is OK for now ...
today I'll try ArmA to see if the problem is present or not with original catalyst
That's strange .. here i tryed bf2142 and no issues ... maybe your videocard are not fully fully supported... like same here lol with my videocard an bundle ... the (6.9) catalyst ... i instaled it first ... and it's dosent recognise my videocard haha^^ so wait about 1 or 2 catalyst drivers and maybe that's will be fix or try the support at www.Ati.com!