If you are using on-board video, no luck- no support for win 7.
Your mobo has Intel 865GV extreme graphics, which is not supported by Microsoft/Intel for win7
Source:
http://www.asrock.com/mb/overview.asp?Model=775i65GV
http://downloadcenter.intel.com/Detail_Desc.aspx?agr=Y&DwnldID=18576&lang=eng&OSVersion=Windows%207%20Enterprise%2C%2064-bit%20version*&DownloadType=Drivers
If you are using seperate video card, you can download the latest drivers form nvidia/amd site depeding upon your card specs.
Hope this helps!