Windows 7 graphics/video driver

I have a similar problem to the people with Windows 7 when I play movies the audio and video don't match and when I try to play the games that come with the system it sends me a message that says hardware acceleration is either disabled or not supported by your video card driver, which could slow performance. My computer originally had XP but I had to wipe my hard drive because of a virus and installed windows 7, I believe my video card is Intel NM10 express. What graphics accelerator do I need to install and where do I find it? Any help is appreciated thank you. I have a Dell mini inspiron 10.