I can confirm that this problem is a 8800 driver problem. I previously had a 7900gt installed using 163.69 drivers and it worked fine. I have just installed a 8800gt using 169.25 drivers and I get this 2 second freeze problem (in both 1.09b and 1.08). Unfortunately I cannot take Godfathers advice and downgrade to 163.71b as it came out prior to the 8800gt's release, and does not recognize the GT, so it won't install. Stuck with this problem until nvidia sorts out it's 8800 drivers. BTW I do not get this problem with any of my other games, just ARMA.
my specs
AMD dual core 4600+
3.5 gig RAM
Vista 64 bit - with all the updates
8800gt -169.25 drivers
no viruses or spyware
no background apps