There is a cheap option if you don't want to wait the 6 to 8 weeks (or more) and are tired of fighting with the upgrade process. Vista o.e.m. versions sell for 129.99 (Home Premium) and 199.99 (Ultimate). Full version, but some licensing "catches". It is legal; it is sanctioned by Microsoft. PCmag has some details here:

http://www.pcmag.com/article2/0,1759,2087792,00.asp

plenty of info on the microsoft help forums also:

http://windowshelp.microsoft.com/communities/newsgroups/en-us/default.mspx

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Personally, I'd drop the $130 before I'd spend hours trying to validate a service tag number and countless phone calls getting the runaround, just so I can wait 2 months. True, you won't get free Microsoft support, but I can't think of the last time MS support actually solved anything for me! The help articles and forums are where the solutions are generally found!

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Just a thought.....