According to SystemRequirementsLab, everything should be sufficient for Witcher 2 except maybe the graphic card. For future reference, that's a very important detail when you're looking for this kind of help, even if you "don't care about graphic quality, just want the game to work".
I think that Star Trek Online should work, whether you're on Nvidia or Intel integrated graphic card.
Edit: Based on some extra research on brazilian notebook shops using the specs you posted, I'd say you have an Intel HD 3000. And according to some random posts on the intrawebs, Witcher 2 *could* work, though you'll probably get very low fps (15-20 in the best cases) even with the lowest configurations.
Post edited December 08, 2012 by retsuseiba