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How to move Microsoft Visio to another computer

sfrisk asked
I purchased MS Visio 2003 online and downloaded it.  I don't have the media for the software and didn't write down the license key.  The PC that it's on is no longer being used and I would like to transfer the license to my new PC.  Is there a way to unregister it from the old computer and put on the new computer?  
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Here's the instructions to get the installation media from Microsoft, http://support.microsoft.com/kb/326246.  The caveat is that you need proof of purchase.
http://www.nirsoft.net/utils/product_cd_key_viewer.html is used to recover the license key from the installation.
Use AIDA32.
AIDA 32 can list your key