Ati Xpress 1100 on CoD 4

ok um my system specs are
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intel pentium 4 duo 3.00ghz
cpu speed 2.99 rated at 4.49 ghz
2 gig ram ddr2
ati xpress 1100

and and and my ati xpress 1100 since i putted a buffalo 1gig ddr2 to get 2gig ddr2 ram and when i checked on canyourunit.com it said i had 895 mb 0.0

can i run cod 4 cause i can run left 4 dead with almost no lag when i close desktop windows manager for vista and cod requires a card with 2.0 shaders in minimum and one of my friends ran cod 4 on a radeon 9600 on low and had no problems 0.o