Windows 7: Minecraft Doesnt work, Pixel Format not accerated please help

hello im running window 7 ultimate on 1.0 gig (please laugh its kinda funny :P) and service pack one.

My graphics card is: Intel(R) 82915G/GV/910GL Express Chipset Family

so i updated the drivers till there was no more updates then launched minecraft as usual. It took a while since you cant depend everything on a intel pentuim 4 :P
and also i have terribly low ram. Then it comes up. Ok so i login and wait for a while. BAM minecraft crashed and itsaid pixel format not accerated.



Now what i have saw earier with the computer is that when i went to window xp i tried minecraft and it perfectly worked!Little lag but thats it!

now when i upgraded to window 7 its being a poophead! So please can anyone help me?

BTW srry i dont think this is the right place for this post! Srry im a newbie..... and blind :P

And if i had to upgrade, where to get the video card

EDIT: i read that my comptuer graphics card slot thingy is PCI