If you have upgraded you have probably got, some where on your machine, an older non compliant bit of software. Just a guess but most likely.
Where there are examples like this either it's trail and error to find the culprit or a clean install with re install of software until the offender is found is the usual approach. Your choice of course but if you decide to do so this is how to do a clean install from an upgrade disc.
If you are struggling with authorisation you will need to ring Microsoft to explain what has happened.