Frame-rate Issues

[brasil]

First, sorry, i have no nice english.

Here too, cant join on san francisco "missions", the screen starts freeze, impossible play.

I can save game with freezes? Yes, but, close and open new game the freez continue.

Have no distorted screen, just freezes in the game.

Game info: ENG All updates ok

System Info: Win 7 64 "all up dates ok" - Have no vírus. - Drivers, sound, video all up dated.

Hardware info: Phenom II x3 5Gb DDR2 - MB ECS A780GM-A Ultra Black Series - ATI HD 5770 1Gb DDR5 XFX - (Juniper XT Protocol)

I think all undestand-me, sorry a bad english.

Have nice day.