Boot the PC by a bootable DVD/pendrive with 7 ISO inside. Choose Repair Computer, then Command Prompt Type: bootsect /nt60 C: <Enter> This command will delete the loader rewriting the bootsector, restart normally and insert cert and key.
Thank you, Ipmark. I already installed the loader with option "ignore the SLIC" and it worked. However, I have now SLIC ver. 2.0, how could I convert to SLIC ver. 2.1? Should I make a RW report and other things, then request a new mod?