you dont have enough ram or cpu power to run gtaiv smoothly. the other games should run ok, the cpu is still slow though. If your running win XP you will have enough ram, but for win7/vista 3gb or more ram is a must.
you gpu is fine inno is a good make, although I would have suggested a 460. Both your ram and cpu are going to be limiters (probably in that order) You'll get good on all the games except gtaiv. I imagine it'll still be playable.. but with 2 gigs of memory, it's bound to stutter or hang
edit: Have fun playing prototype, sick game that didn't get enough coverage
I have never heard of that brand - although if it is only foreign (I am in USA) then perhaps that means nothing.
You can find good general information about video card brands at the following site (although it really only addresses US brands - I don't see anything about foreign ones - I thought they were all pretty much international, since few are probably manufactured in the USA anyway);