Dear All, I have 3 compaq presario V3660TU laptop that was purchased by my indonesia associates without windows vista, Now I need install my corporate Vista Enterprise version. Installation is ok, but it just do not let me activate Vista it prompt that the laptop does not have a qualifying OS to upgrade. I check the bios, it does not have a windows marker. Please advise how I can modify the bios to make it able to activate my vista enterprise, btw it is a volume based one many thanks and regards, aven OEM Activation 2.0 Data--> BIOS valid for OA 2.0: yes, but no Windows marker Windows marker version: N/A OEMID and OEMTableID Consistent: yes BIOS Information: ACPI Table NameOEMID ValueOEMTableID Value APICPTLTD APIC FACPINTEL CRESTLNE HPETINTEL CRESTLNE BOOTPTLTD $SBFTBL$ MCFGINTEL CRESTLNE TCPAIntel CRESTLN TMORPTLTD SLICHPQOEMSLIC-MPC SSDTSataReSataAhci SSDTSataReSataAhci SSDTSataReSataAhci