My Arma 2 runs very well, except when I enter the town Chernogorsk. After a few seconds a reboot crash occurs. This happens in the Harvest Red-campaign, also as in the Editor, when I enter Chernogorsk.
My System:
Win XP, Pentium D Dual Core 2,8 GHZ, 2 GB RAM, onboard sound, Ati Radeon HD 2600 AGP. Patch 1.05 (latest beta also)