W97m.Cooldown False Positive?

Recently I downloaded a office 97 spreadsheet with macros from a trusted website.  Whenever I open the file, enable the macros, and then re-save the document as a excel 2007 macro enabled worksheet, I get norton telling me that it is blocking W97m.cooldown. 

 

I can find no record of this virus/threat anywhere on the internet nor can I find it in the threat database on your website.

 

Please help me identify my problem and find out if this is a flase positive, or if I really should stop trusting the creatr of this spreadsheet!