Post a image of slic dump tool kit please, i think there is a problem with the slic in your bios. Second thought is if you where using a loader before ?
Win7 Activator I am getting ready to release my automated Vista and Win7 Activator which uses the legal way to active Its a inhanced version of the old OEM scanner for XP. The program runs returns the value for the version of the OS then loads the proper cert and the key to match the OS works on Vista and Win7 I use mine in a firstlog command on unattended.xlm but you can run this manual.
Same issue as you but with a VAIO AW and official BIOS with SLIC2.1. To change your ISO version in the Sources folder delete or rename ei.cfg (filename may be wrong, check the 2nd post on the MDL Win7 news page) then you get the option to install any version. Let me know if you find a fix. moosh101, the guides say SLIC2.1 + CERT have to match. OEM SLP key can be from any manufacturer as long as the Win 7 version is the same.