my old lady has the very same laptop. i have been able to play, without a problem- the games you mention ( "cod black-ops fallout new vega sniper ghost warrior" ) as well as the latest medal of honor, bad company 2, gta iv, gta san andreas- you name it the vaio vpcf11fm will play it.
did you update the bios? did you update the graphics driver? visit the factory support site, man. either you have broken it yourself, or it came broken. both of these things happen. but as far as the laptop model goes, it will play anything out today, and very well.
and by the way her laptop is stock, no mods of any sort.