I have no relationship to any company producing A/V software, so these are purely personal views.
Dr Solomons used to be good, but now it is part of Mcafee it has gone downhill.. .Also had lots of problems with Norton screwing up.
One I prefer at the moment is PC-Cillin by trend.
Not only does conventional filestore virus protection but also real time web page pretection (integrates with IE) and real time PoP3 e-mail protection (integrates with Outlook)
Downloadable, and auto updating.
That's my current tuppence worth.. .Cheers