Info on McAfee Superdat definition Updates

I notice that when it comes to Norton signature updat:confusedes, majorgeeks has a category for 2003-2007 and a category for 2008-2009, will the same be the case for McAfee signature updates? The reason I ask is that I have 2 laptops, an older Dell Latitude w/XP and McAfee Security Suite 7 for which I have been getting signature updates for a while with no problems, but, with my newer laptop, an Acer Aspire 5735 w/Vista and the McAfee Security Center that came with the laptop and purchased on 12/16/2008 when I download the signature updates for the Acer and try to install them via the Superdat download, I'm told that it cannot locate a qualifying product for the update. Is there a separate version for the newer McAfee version and for the Vista version, and if so, where do I find it? Thanks guys.-o