Windows 7 Graphics Driver Problems

Hi, I have an HP Pavilion dv6 laptop and I recently formatted and installed Windows 7 Ultimate. However I could not successfully install my graphics drivers. First, I installed the driver on HP's website.But now Intel Driver Update Utility says there is a newer version. When I download that newer version and try to install it, it gives me the error "The contents of this file cannot be unpacked" . I am also having the following problems. However I could not find a way to solve these problems other than using other driver utilities. I'd appreciate any help.

1) There is no brightness setting
2) Can't run any video games
3) Windows Experience Index doesn't work ( "The WEI for your system could not be completed")

Intel Core i5-3210M CPU 2.50 GHz
Intel HD Graphics 4000
Directx Latest Version Installed

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