Ok first off... where did you download your patch from? is your game retail or steam? or other? have you
had any troubles with patching ArmA2 before? and finally, have you made any modifications of the folders
or moved any folders etc that are needed for the patch?
You should also take a look at this
to make sure your doing it right etc...
Finally, welcome to Armaholic
(sorry but im off to bed, its 7am here not slept all night, so sorry for late reply if any)