I had to read it twice but, keelon.ellis is asking how to use his phone to connect his desktop pc (no wireless adapter) to his wifi router for internet.
I just tried this on my phone and worked rather surprisingly.
With your WIFI On on your phone, go to Settings/Wireless and Network/Tethering
Plug your phone in to your computer's USB. Then you should see USB Tethering highlight to be able to enable tethering. Once you turn it on, it will load up a network driver for the computer and you are ready to go from there.
*if it doesn't work, you may first need to install Samsung driver for pc
here. thanks to AC's DroidXcon's page
here.
I tested speedtest.net on my laptop, with its wifi off of course, tethered to the phone and got full download/upload speed off my internet connection. It also displayed my ISP so I was sure it wasn't using my phone's data connection.
Although this is nice, it would be best to buy a wireless adapter for your PC. They are extremely cheap now.
Here's a couple examples to get you started.
Amazon.com: TP-Link TL-WN722N 150Mbps High Gain Wireless USB Adapter: Electronics
Amazon.com: AirLink101 AWLL5088 Wireless N 150 Ultra Mini USB Adapter: Electronics
I'd choose the mini usb if the wireless router is near by or one with an antenna if farther away. For obvious reasons. Hope it helps.
-GeNeS