Playing games on my laptop?

i got an hp laptop. i have a big hdd and 3 gb of ram. my processor is core 2 duo at 2Ghz and all is good but my graphics card. ive been to can you run it ( google it and its a site from system requirements lab that tells you if you can run games. and it tells me that my video card can has all the requirements but it gives mt a rating 1 bar under the minimum, but i can still play the game ( such as doom 3 and quake 4) and i was wondering if this is bad for my card, and also i wanted to get prototype but it said the same thing as doom 3 and quake 4, i had the requirments but still not at minimun. and the processor said core 2 duo at 1.86ghz + and i have a core 2 duo at 2.00ghz and it says i cant run? i need help and answerss