... code Condition=AndOp,Prereq.XPAMDInstallBlock.Section and the end (end of line): Source code [Prereq.XPAMDInstallBlock.Section] PresentOp=CheckReg,HKLM,"SYSTEM\CurrentControlSet\Control\ProductOptions",ProductType,0x00000000 NotEqualOp=CheckReg,HKLM,"SYSTEM\CurrentControlSet\Control\ProductOptions",ProductType,0x00000000,!=,"WinNT" ...