Can't connect to internet wirelessly with WRT120N router

Question

ok, it's nearly 4am and i've been trouble shooting this problem since 11pm... love the technology, but it completely evil...
let me start off by saying i'm not too tech savy. took a couple computer courses in high school and thought it was my passion but they got way above my head in college, so i settled for art (those classes are much easier to pass as long as you draw your homerwork, don't blow up your sculpture etc etc)
anywho, i bought a brand new computer today since i play wow and my old computer was nearing on a decade old and had nearly a dozen manufactury resets from all the viruses from downloaded music. i don't know the make of the new computer (just spent like five minutes looking over the box and it doesn't seem to say) and i literally walked into best buy and walked right up to the computer department store head and said, "which computer should i buy to play wow on for less than $600." he thought for like thirty seconds and pointed to an ASUS and i immediately bought it. took it home, watched tv for a couple hours, then went to set it up since i had a raid in like two hours, thinking, "brand new computer, nothing's gonna go wrong!..." 
well it did. my router gives me grief from time to time, so i spent the first hour unplugging, resetting, refreshing (i think that's what the button by the blue lights that has the circling arrows does) and nothing. so then off to the interweb since... oh! this might be important! the one computer i'm on now that has a hardwired connection is running normally, not great, normally. and i just checked my mom's ipad, it's on the network too. my phone, a samsung galaxy s 4 had been connected since i had it, and decided to stop connecting when at least until i noticed i couldn't connect my new desktop and my gf's phone, an iphone 4 wouldn't connect either... in total, i think there's one wired desktop connection, my fail wireless desktop connection, wireless laptop that hasn't been opened in months, an at&t signal booster, an ipad, and 4 phones that connect when they feel up to it. my old iphone 4 i ran on 3g because it was more reliable than my wireless. there's never more than 3 devices running at once. i've seen a few threads mentioning too many devices on one network. could that be it? i hope not. we have comcast as a provider too, if that helps.
oh, and maybe i should describe my problem more clearly. on my phone, when i go to the wifi settings, it still list my network as one i'm linked too, it's just "not in range" and my new desktop can't see it at all. pretty sure it's not a hidden ssid because i connected my phone to it recently and had no probs. also, i'm fairly, but by no means 100%, certain that it's not the wireless card in the computer because i can see a few other networks and my phone had already been on it without giving me problems until earlier today. 
if you know how to help, please be thorough in explaining it, and if i need to give more info, i'll try my damnest. please please please!!! help me, i spent all my money on this **bleep** computer and don't have anymore to buy another new router.

Answer 1

Hi there. To start, that blue button that you have been pressing on the router is the Wifi Protected Setup button. You press that button when you want to connect a new wireless device that supports Wifi-Protected Setup to connect to the wireless internet via your wireless router without having to enter anything on the new wireless device. So it means, you did not reset the router. I would like to verify with you though because it is not clear to me (sorry), how do you want your new desktop computer to work? Wirelessly or with Ethernet cable plugged-in? If it is for wireless, you will only need to connect the computer’s wireless connection to the router wireless network and to enter the wireless password if you have wireless security enabled on the router. Also, the router should be able to provide simultaneously internet connection to multiple devices – be it wired or wireless. Sometimes the reason why the wireless would not work is when there is wireless interference in the area that you will need to change its wireless channel to something else. To have wireless security enabled on the router is helpful as well in making sure that the router will provide a better connection speed.
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