Wondering if anyone can help. I have an Acer laptop that came with Vista and already had a SLIC 2.1 table in the BIOS, as well as an Acer OEM certificate. I upgraded it to Windows 7 Utimate using the Acer OEM SLP key without issues. Last night, the system crashed. Upon rebooting I was greeted with the not genuine / counterfeit software messages, as well as the watermark. After trying to reinstall the product key + certificate, reflashing the BIOS and rearming to no avail, I thought I might have a corrupt tokens.dat, so I erased it and recreated it using the "slmgr.vbs /rilc" command, than reinstalled the certificate and OEM SLP product key again. Still not working. Windows says the Ultimate product key is not valid and is giving me 30 days to activate. Strangely it seems to be a problem with the certificate. SLIC DUMP tool reports that SLIC 2.1 in BIOS is OK, product key is correct, *BUT* the OEM certificate is not found. I'm fairly certain that Windows SP is not seeing the certificate either. However, I CAN SEE the contents of my certificate file in tokens.dat if I open the file in an editor. Any idea what's going on? Thanks for any ideas.