Would buying a Wireless USB Network Adapter provide desktop with wireless internet?

Yes. if the USB was designed to receive and send internet signal, then yes, it would work.

although i dont know if you would need software to make it compatible or not, ive never used them.

Depends if it receives the same type of signals your router sends out, Best Buy should be able to help you, go ask them if you really need something ASAP.

If your close to your router just use the Ethernet cable

Provided you have a wireless router and settings are correct, yes. Check this

http://www.tigerdirect.com/applications/category/c...

only if it is a wireless router, look for two antennae on top

yes it would that what the wireless card does

in case you're walking domicile windows 7 and above, please run the diagnostic utility equipped into the working physique of techniques. which you will possibly have the flexibility to get entry to this with the aid of way of typing, "restoration information superhighway" into the seek. you will see an decision for locate and fasten community connections, run this and please repost the outcomes.

Yes but wired is way faster.

yes it should