I need help sharing files between my iBook and my wife's PC.

I am using a Linksys WAP/router/switch for connecting our computers to Roadrunner. I am using wireless for my iBook and the PC is connected through the switch. I am using all of the default DNS settings to connect to the internet, and until recently I have not had a need to pass files between the computers.

iBook OS X 10.1.5
Compaq laptop Windows 98SE

How do I need to configure my network settings to be able to see the other computer.

Thanks