I have what seems like a pretty similar setup (minus the SQL backend) and I get the same errors. I just have a computer setup in my house running Win2000/IIS 5/PHP 4.0.4 just to do development/testing on, and it seems that after the server's been running for a couple days or so all PHP scripts start producing this error. It's not a RAM problem; I've had no other problems with the machine at all, and I've had been using the server for many months doing ASP and other web development with no problems. Also, just like him, the problem is fixed with rebooting (or just restarting IIS). ASP scripts and regular HTML files are run and served just fine, but PHP scripts give this error after IIS has been running for a day or two.
If anyone can help with this I would also greatly appreciate it.
Thanks,
Andy