While we are waiting for Sony Vaio and McAfee user(s) to post their thoughts/experiences, you might to check also at McAfee forums:
Rule of thumb is make sure your Windows is up-to-date (please open Windows Update program in Vista to check for updates), remove existing anti-virus or 3rd party firewall software before installing McAfee.
Has anyone had experience good or bad after installing MacFee virus protection on their new Sony Vaio Laptop? Anything I should be careful of?
My Sony has Intel processor with Vista running, 3G of memory and 256GB of storage.