Frame-rate Issues

[raiken]

good evening all!! i am new around here... and i hate to introduce myself asking for solutions

as i can see there is no newer patch/fix for english version of rnr. i have same problems issue regarding frame rate near to greenfield and san francisco.
i've tried to solve this updating vide ocard drivers... but unfortunately things went worse!!
for example: the movie from beginning is playing with 60 FPS (instead of 220 - like he did before updating drivers)... and instead of 25-30 PFS (in game)... now i have 8-10 fps.
i have tried to roll back video drivers... and nothing!!! i've tried 3 different plder drivers from nvidia and nothing.. the game remains unplayable .
is there anything special to do??

my comp specs are: Core2Duo E6300 - 1.83 Ghz (overclocked at 2.8 Ghz), 5 GB of ram (3.5 usable cause i am using 32 Win7 32 bit), nvidia GTX 460 (1GB/256bit) video card.

does anyone know if a new fix/patch will appear??

also: i played crysis 2 with all details maximized (without anti aliasing)... and rarely i went below 27 frames

please help!!
thanks in advance
greets raiken