Security Center says the DAT file is not up to date. It tries to update it, apparently this does not work. The cycle continues time after time.
Mc Afee Virtual Technician also says the DAT is out of time. He updates it (that's what it looks like). However, no update is done or the update is not effective/not registered/not logged. This is a nice deadlock: a problem is detected -> it is fixed -> and again detected.
The usual Tier 1 advice of uninstalling/reinstalling usually doesn't do any good in these instances - you uninstall, and then reinstall with an ancient DAT and it can't get the most recent one because of the bad-DAT push - and you end up being worse-off protected than before.
This appears to be the second bad push in as many months...
The problem is solved by doing a DAT update a couple of days later. Apparently the corrupt DAT update is overwritten by a newer correct DAT update. For the same money, the entire stuff or pc has to be reinstalled. Note that the new DAT update took significant time.
So after all the positive message is that the DAT update mechanism itself is very solid. Even if you receive a corrupt DAT or the processing of the DAT itself is corrupt, the newer update whipes out the rubbish.