You lack a decent dedicated graphics card, I'd say. Both those games wont work without a dedicated card. Borderlands 1 would barely run on my laptop with a ATI 1600m on it, so no chance an intel 4000 will work with it. Here is tom's graphic hierarchy chart, go look where yours is, roughly the equivalent to a AMD 3670 or 9500GT. Minimum for Mafia 2 and Borderlands are almost enough for you, but integrated Intel graphics will never match up to a dedicated card
I wonder if I could play it with minimum sitting. I think the problem isn't in my hardware. I could play many games with medium/low and even high. Like CoD:BO/CoD:MW3/Bioshock:Infinite/ACIII/BF3 and more. I mean there may be a fix of something could do it. Thanks a lot for your reply.