The obvious place to get Intel drivers is from the Intel website by searching for your model board, which would lead you here:
http://downloadcenter.intel.com/SearchResult.aspx?lang=eng&ProductFamily=Graphics&ProductLine=Desktop+graphics+controllers&ProductProduct=Intel%c2%ae+82865G+Graphics+and+Memory+Controller+Hub+(GMCH)
Select Windows 7 in 32 or 64 bit depending on which you have installed.