SORRY,當時沒仔細看F-SECURE的官網仔細說明,節錄如下:
from:http://www.f-secure.com/download-pu....shtml#windows2

Download latest.zip and save it to hard drive. In F-Secure Administrator open the 'Tools' menu and select 'Import Virus Signature Database...' to import the downloaded databases.

我找不到上處說的選單,但是你可以試試將latest.zip 解壓縮放在
C:\Program Files\F-Secure\Anti-Virus\dbupdate

假設你用自定安裝的話,麻煩你試試了