Finally, I got it!!!
After several reboots, permissions repairs... Finally i can locate my MBP...
All i've made is repair permissions and repair disk, reboot, and then, download again the update from here (http://support.apple.com/kb/DL1464) and install it. In my case, the installation didn't finish... always telling that the installation will be finished in less than a minute, but not... after 30 min. I force the exit of the installator and reboot...
Then I went to Software Update like quicksilver8 tells:
Same problem, but fixed restarting and going ahead with Software Upade. It catch missing Recovery Update and reinstalled it.
But I have no updates to install 😕... Then i went to iCloud's menu, and, finally, i could activate Find My Mac!!!
I hope this can help you... but sorry about my poor english and my explications.
Thanks all!!!