Use a USB wireless adapter. This is the easiest and quickest method to enabling wireless capabilities on your desktop. Plug the USB adapter in to any USB port on your computer, and follow the installation instructions that pop-up on your screen or insert the installation CD (if any) that came with the device.
Install a PCI interface wireless network adapter. To install this type of adapter, first shutdown the computer and open the computer case. Then, plug the card into an open PCI slot on the motherboard. Replace the case and start the computer. Follow the installation instructions that pop-up on your screen or insert the installation CD if one came with the card.
Set up a wireless access point (WAP). Connect a wireless router to your computer using an Ethernet cable, then setup the internet protocol address, username and passwords from your network properties menu.