In https://www-secure.symantec.com/connect/forums/backup-server-not-available-after-windows-update-0912
that post i got an error that only appeared when oppening the BE Console.
As i wanna to test the BETA 15 i get some errors regading the begging of the installation that a string could not be found.
The error pointed to be something related to WMI.
So we start debugging the issue and i found that i have issues on GPMC in the wmi filters that couldn't be shown .
Using webmtest could not see any error only on using the RSOP.msc and GPMC consoles i got similar errors.
Regarding this i did a reregister of dll amd mof files using this script
http://blogs.technet.com/b/janelewis/archive/2006/09/22/458132.aspx
and voilá everything back to normal.
Now the only thing i don't is that was the Tuesday updates the cause of this or a normal breakdown of wmi database...
Either way is now solved.