To check if the mod is working, please install AcpiScope, go to file---->load information----> from bios, save and upload the *.ATS file.
ats file @Yen: As asked by you, here's the ats file for my board. Edit: Installed one of the older modded bios for the my mobo from this site i.e., Biostar TA690G 5.X_R69AMC13.BST_Slic. Installed the key ending in 932CC. Installed the OEM cert. Vista is activated !! Installed SP1 - still activated !! Thanks for your help Yen. But please do have a look at the attached file. So we can atleast know if the new bios had an issue !