Victim Of Counterfeiting? - Resolve Later Allows You To Log On

You may be a victim of counterfeiting ! My sons 2nd hand pc running XP is getting boxes with this message (You may be a victim of counterfeiting) there is also a 5 pointed starlike icon in the system tray which gives a yellow box with the same message ,when you switch on the pc there is a 16th screen box bottom right corner same message ,when you log in a 1/4 screen box comes up same message with buttons to resolve now(?) and resolve later,which by hitting resolve later allows you to log on and the pc seems to work fine.

It does appear to be from MS,anyone else encounter this? Whats the story? As well an unrelated occurance ,on the forum index for this thread when I run my mouse over the forum topics and get the little hint box that tells you a bit more I am getting in amongst the words (are you ready for this?) swastikas??? I do have a Japenese font called Kagijuuji that has swastika like symbols and it looks like one of these.