How Do I Operate Adobe CS3 on New PC [CS3 IS DEAD]

Hi @William5E09,

CS3 is dead.  Even if you have an installer and valid serial number, the aged out activation servers were retired years ago.  It's impossible to re-install CS3 now.

If you had upgraded to CS4, CS5 or CS6 when you still had the chance, you would have software you can use.  But unfortunately, that ship sailed long ago.

Keep using CS3 on your old computer for as long as you can.  And get modern software for your new machine.

MODERN OPTIONS:
Photoshop Elements or Premier Elements 2021 (approx $100, no subscription needed)
https://www.adobe.com/products/photoshop-elements.html

Creative Cloud Photography Plan -- approx $10/month x 12 months. Includes the very latest versions of these great products & services:
-- Photoshop CC and Photoshop on iPad
-- Lightroom on desktop, mobile and the web
-- Lightroom Classic
-- Portfolio website + hosting
-- Spark with premium features
-- Bridge
-- 20 GB cloud storage (upgradable to 1 TB).
https://www.adobe.com/creativecloud/photography.html

Creative Cloud All Apps (31 + apps & services) or Single Apps Plans
https://www.adobe.com/creativecloud/plans.html

=============
Beware of fake Adobe reps who may contact you privately offering to sell you software or take control of your computer. It's a scam, run away!  Creative Suite is not legally sold from any vendor, retailer or country.
=============
3 Easy Ways to Identify Genuine Adobe Staff
https://tinyurl.com/10791730

CS3 is a completely dead program due to the activation server being retired