There are at least two possibilities.
1. The on line source scammed you.
2. The license is genuine, and you need to make the phone call to MS
concerning activation.
(There are a number of reasons why on line activation can go awry.)
<Arnelbee from Dublin>; "Ireland" <Arnelbee from Dublin,
Ireland@xxxxxx> wrote in message
news:2D6F24E9-1DCD-4010-B787-9CA3B00FAAD7@xxxxxx
> I UPGRADED MY XP TO HOME PREMIUM VISTA AND SUCCESFULLY ACTIVATED WINDOWS BUT
> WHEN I BOUGHT AND UPGRADED TO ULTIMATE BY BUYING DIGITAL LICENSE ON LINE,
> AFTER A SUCCESSFUL INSTALL , I COULD NOT ACTIVATED WINDOWS ULTIMATE AND IT
> SAYS THAT I HAVE 1 MONTH TO ACTIVATE WINDOWS.THAT THE PRODUCT KEY HAS BEEN
> USED ALREADY..
>
> NOTE: I AM RUNNING A DUAL BOOT XP AND VISTA ,HOME PREMIUM OS WAS INSTALLED
> IN DISK D.
>
> HELPPPPPPPPPPPPPPPPP!!!! please....