Well OK, I accept that I might be wrong, but I have checked my Update History, all have updated successfully and though some have similar numbers, they are not all the same update. Not strictly updated on a daily basis, but can happen several times in one day, and at least every other day, if not daily.
Running Win7(64Bit) on a four month old laptop. No problems anywhere, all running great!
Actually it might be me that owes you an apology as I have just looked at my history and if you have your PC set up to install all updates automatically then it might well be a daily occurrence particularly if you run Microsoft Security essentials.
Which for some reason known only to Microsoft, MSE does not update its virus database automatically.