Recently I had to restore my computer (4 months old) to factory condition since I had a problem with Vista. An automatic update changed my Vista license to an invalid one an my computer could only be used for the Internet and only for 1 hour at a time. After e-mailing Microsoft support technicians for a month with no results, I went ahead and performed a system recovery and restored the computer to the factory condition (I don't know if I am using the correct terminology). Then I disabled the Automatic Updates feature so it has to ask me if I want the updates.
Now, the system restore hardly ever works, even when using the recommended checkpoints or any other available date.
I have read somewhere that it can be due to having Norton anti virus installed but it does not make much sense to me. Please consider that I am not too computer-savvy.
What can be causing this problem?