Thanks a lot, typing LOCAL SERVICE did the trick. I was typing also the prefix "NT AUTHORITY"

Thanks again :)

Thanks a lot for your answer, but after opening Component Services and trying to add NT AUTHORITY\LOCAL SERVICE to enable Local Activatin permission, i get the following error "The following object...

Hi,

this is the error i'm getting in the event viewer when my computer freezes:
The application-specific permission settings do not grant Local Activation permission for the COM Server...