You can download window LIPs of Microsoft http://www.microsoft.com/downloads/details.aspx?FamilyID=a1a48de1-e264-48d6-8439-ab7139c9c14d&displaylang=km
After You download ready Please double-click on LIP_km-KH-32bit.mlc file For Windows 7 32Bit and LIP_km-KH-64bit.mlc file For Windows 7 64Bit.
Then you can start up windows again before you get window 7 in khmer version.
