RT7lite not compatible (no slipstream) with SP1 RC Wave1 (windows6.1-KB976932-X64.exe 865MB) download from microsoft. SP1 RC Wave1 download: http://www.microsoft.com/downloads/en/details.aspx?FamilyID=c3202ce6-4056-4059-8a1b-3a9b77cdfdda&displaylang=en Sorry my english