Computer connection problems

I bought this windows 7 pc at a pawn shop. I just factory reset the pc and tried to connect to my wifi. But I only have the option to use an Ethernet cable or a dial up. I don't have any Ethernet ports in my room, so I'm kind of in a delema here! Is there someway I could connect this thing to my wireless connection?
 
If the PC does not have wireless built in you will need an adapter, you get small little adapters that work via usb that you can plug into the back of your PC and forget about. You should be able to find them relatively easy in shops. If the PC is supposed to have wireless and you cant get wifi it will be a simple Driver Issue where you just have to download it
 
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