Hi again!!! Finally I managed to upgrade mi environment.
Yesterday I tried to stop all services, uninstall only SSO and new install SSO 5.1u2. I got another error that I found it was caused by bad/corrupted JRE folder (in \\program files\vmware\infraestructure), so I renamed that folder to "jre.old" and repeated the installation. It worked, but later vcenter server couldn't upgrade due to problems with SSO integration...
I recovered one more time the entire server and started again from ground. FINALLY THE SOLUTION!
-Stop all vmware services
-Rename/delete/move "jre" folder
-Start upgrades from the UI in the typical order (SSO, Inventory, vcenter, client, web client)
Now working after three days of trying.
I expect that effort to help anyone!! xD
Thanks.
Dave338