Hi
here's an idea.
Go Linux.
It can run well even with old computers and its got apache and mysql (or most other sql databases.... but pls check first b4 quoting me on it... but i know they have mysql cos i'm using it).
Also its far more stable to be a server than windows. My linux machine has been up for more than 3 months!
Another plus is that apache and mysql can be configured the way u want it. Eg, u can have pdf lib included etc.
However, there is a learning curve. So be prepared b4 making the move to save urself some headaches on the way.
🆒