I had tried to install RH9 on pc with configuration equals to yours but atm processor was fast enough . It was P4 1.5 Ghz .
But still i was not able to install, then I Installed RH7.2 in text mode.
RH9 needs a good processor.. basically ghz one and min. 96 mb of RAm but practically 256 should be considered minimum. Hardisk is also very low in space for u!
I have suggested smoothwall, which is meant specially for gateway but not webservers.. still you can install apache, php , mysql etc on it.'
If you can increase RAm to 256 mb the you can do.. but still later hd will become a barrier.
Alternatively.. Install an old LINUX distro which as low system requirements.