Hi Gray - there is Kaspersky Internet Security 2010 out now, and it should work with your existing key. It works very well under Windows 7 (I'm even using it now) - so I'd go to the Kaspersky site and download that
Assuming you want the English version, the latest version to download via FTP is here:
ftp://ftp.kaspersky.com/products/english/homeuser/kis2010/