I get the same alert for 2 apps everyday even after I have run the upgrade the day before. It only happens on 1 machine. not the other (same apps installed on both machines).
You might try these:
10.7 - http://support.apple.com/kb/PH4600
10.8 - http://support.apple.com/kb/PH11468
Windows 7 - http://windows.microsoft.com/en-IN/windows7/Create-a-user-account
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