I just got my MacBook Pro for college and I was trying to activate Microsoft Office 2003 on my Windows Vista Bootcamp partition and I ran into this issue. At first I tried activating it on Windows XP, it didn't work. I installed Vista, it gives the same error.
I've Google'd, Bing'd, and whatnot.
Here's a pic of the error I get when I try to activate over the Internet:

I need to figure this out before tomorrow, as my "Big Presentation for my Senior Year" is due. Thanks.
And for those wondering, I ran it on my desktop and it activated perfectly. No issues, even activated under Crossover on the Mac (But it has issues when it comes to Powerpoint).
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WWDD? - What Would Dale Do?