connection problems

Hello,
I recently bought a new PC, and I've had it working super great in my living room. Today I decided to move it into my bedroom, and when I got it moved and powered up, the internet doesn't want to connect anymore. The computer detects the network, but it won't connect. Actually, it isn't even giving me an option to connect to the network...but I see it there, lingering and taunting away. I have three other computers in my home--all three without any problems (they're laptops) and connected to the same wireless network. I'm at a loss, and I am absolutely not a networking genius. All I did was move the computer across the hall! Any ideas would be appreciated!
Kristin

 

I just wanted to add, after doing several resets on the Linksys router and troubleshooting (this pc runs on win 7 os), that the computer does see the access point (I'm guessing that's what's going on). Troubleshooting is saying "Problem with wireless adapter or access point/A network cable is not properly plugged in or may be broken." I didn't have anything from the router hooked into the computer when it worked before, so I can't figure out how moving it into another room would have done this. Just thought I'd pass along more info as it becomes clear and known to me!