i dont think i can afford one right now. since this is what i have is there anything i can do to make it work?

when i tried playing the video was very jumpy it seemed as though everything else was working smoothly. its like, when i tried moving at first nothing happened but then the character would jump to another spot. lol here's the game requirements: Processor: AMD Athlon 64 X2 Dual-Core 4000+ or better or Intel Core 2 Duo Processor 2.0GHz or better Operating System: Windows XP/Vista/7 RAM: Windows XP: 1.5GB Windows Vista and Windows 7: 2GB PCs using a built-in graphical chipset are recommended to have 2GB RAM Graphics Card: ATI X1800 or better* nVidia 7800 or better* Intel 4100 Integrated Graphics or better* DVD-ROM: 8x or better *Minimum of 256MB of on-board RAM and Shader 3.0 or better support. i have a dell inspiron N7010 with windows 7 Processor: Intel® Core i5 CPU M 460 @ 2.53GHz 2.53GHz RAM: 6GB Graphics Card: Intel® HD Graphics (Core i5) i get the feeling my problem might be with the graphics card but i want a more knowledgeable opinion.