i want to turn my Pc into a router with out lossing windows and making it unusable. i have a wireless card and a ethernet card on the same pc. want to use the ethernet card as a router to my PS2. is there a way i can do that?
You can use Internet Connection Sharing, or ICS. If you're on XP just run the Network Connection Wizard.
Open up the Network Connection Wizard from your Start->Control Panel->Networking section. Click "Setup or change your home or small office network". Click on "Checklist for creating a network" and then look at ICS to get an idea of what you need to do and a decent pictorial of what your network will look like. Follow the instructions. (Note: I don't see why you don't just plug an ethernet cable between the PS2 and your wireless router/WAP, if you have one. ICS will work but it's the long, hard way of doing things.)