I see a slight probelm with both helping posts. He's running a slim ps2. A SCPH-750xx series to be exact.
His options with OPL are either USB or SMB. Either way he's going to need the same tools to install to either.
He'll first rip a FULL ISO image from the original disc, then use USBUtil to navigate the target location to either his USB HDD, or will install to a folder on his hard drive so that he can copy the installed game(s) to the net share.
If you need help, post a question in the
forums, not my PM inbox. Thank you.