Searched here for a while and couldnt find a direct solution so I looked around for info and got this working so thought I would post the how-to. I couldnt activate using the latest official bios (A09 released 5/30/2011) ---> hxxp://ftp.us.dell.com/bios/O780A09.EXE From MGDiag: Code: OEM Activation 2.0 Data--> BIOS valid for OA 2.0: yes, but no SLIC table Windows marker version: N/A OEMID and OEMTableID Consistent: N/A I understood this to mean the bios had SLIC but it was disabled. I Tried the Phoenix Tool with no success. Based on what I read here I did the following: This was with a fresh Windows 7 install on and new Dell Optiplex 780 so my asset tag was not set. If your asset tag is set and locked: - Download --> hxxp://ftp.dell.com/diags/DELL_32-BIT-DIAGNOSTICS_5154-1_R302859.exe & extract - Copy X:\Dell\Drivers\R302859\DIAGS\UTIL\ASSET.COM to X:\Dell\Drivers\R302859\DIAGS\ - Run X:\C:\Dell\Drivers\R302859\DIAGS\DDPP.EXE and install either to a USB or CD. - Reboot, boot the USB or CD. - Select Option 4 (quit) - Type ASSET.COM /d and confirm - Type ASSET.COM and you will see the asset tag cleared - Reboot - Set the asset tag to PASS:12/31 via the System Configuration boot menu - Agree to all warnings, reboot - Wait for the PXE boot to time out then press ALT+F (? I think it was ALT+F - its green anyway) when prompted - Reset bios settings - Reboot Now the MGDiag says: Code: OEM Activation 2.0 Data--> BIOS valid for OA 2.0: yes Windows marker version: 0x20001 OEMID and OEMTableID Consistent: yes And Windows will activate with SLP key/cert. Hope this helps someone.