I don't think you'll find a legal place to download the full version of photoshop 7.
The ones you might come across are trial versions that only last 30 days and can't be converted to licensed versions.
What is wrong with your install disk?
Your talking about photoshop 7 or photoshop elements 7?
First i'm talking about Photoshop an the error number is: -106
I must install it as Administrator and now it works