You can't. As stated in your End User License Agreement, the qualifying
product media is part of your license for the upgrade version of Office
XP. When you destroyed your old CDs, you destroyed your license to use
the upgrade. Go buy a full version.

Genielinda wrote:

I see others have had similar problems after re-installing XP. Set up on
OFFICE XP states no qualifying problem found (error 1608). Of course my old
MS Office CDs have long since been destroyed. How can I re-install without
my previous CDs?