I disagree with Riider on this one. Yes, one can download free applications, but my experience is purchased ones are better, as they have the backup resources required to keep their application(s) uptodate.
The main suppliers, being McAfee and Norton. I have only used Norton Internet Security, which in the past relieved my pc of serious problems.
Is your product good for Vista?
You have posted twice.
First it 'disappeared' then it would not auto-update.
Perhaps editing is called for!
Norton only updates if the virus definitions have been updated.
Perhaps McAfee is the same.
If McAfee is anything like Norton, once installed it will run for a while (Norton@1 month) during which it should be registered online. With Norton, automatic updating has to be turned on, otherwise it only updates when started manually.
I suspect you have missed some minor step during installation.
I am in the UK. For installation problems, Norton provide a local telephone number (for me free), although the technician is in India.
If needed, he runs my pc remotely in order to correct any problem.
I have used this (free) service a number of times and they have been a great help. Would think McAfee has the same.
Please advise back on progress.
Good Luck - Keep us posted.