Problem with wireless connection signal

Everything was normal, i was in one of my desktops(non wireless internet, use cable), then when i went to check my other desktop pc(the one with WIRELESS connection, have a Ralink turbo wireless connection) it didnt had any signal from the router. the SSID wont even show up there, like if there is no signal. My router is a WRT54G. I need internet back in my wireless desktop(ALSO I HAVE A LAPTOP, BUT ON THIS CASE THE LAPTOP CAN SEE THE SSID, WHICH IS "LINKSYS", BUT IT CANNOT GET ANY SIGNAL FROMM IT :X) How can i fix my wireless connection? this is really hard to explain, i tried my best. Thanks in advance!~ ——————— EDIT: OK,about the LAPTOP. even tho it have no signal but have the SSID i actually CAN navigate and download like if everything was normal. But my desktop PC(wireless connection with Ralink Turbo) cant find any SSID signal x_x

I hope this isnt considerer as spam,
i attached 2 images that represent the situation im passing by right now, and another one showing a lil of my specs and a bit more of what im passing by >_<, if need any other file like a hijack or CrystalMark idk :S, really need to fix it.

Seems like is just 1 attachment per post so here the other screenshot:

[external image: Posted Image]

get in to your router by typing 192.168.1.1 navigate to the wireless tab . make sure that wireless is enabled . check if you have encryption enabled . reset your encryption password . try to connect . if you can't connect reenter your router disable your encryption and try to connect again . if you can connect then you probably entered your password improperly . here is a good 64 bit key 6EE41F1A8B . don't use it make your own . if all goes well then try to improve your security by enabling WPA2-AES encryption . Here is an example of a 504 bits WPA key: f-h-2HmaJvD%SN4uGGJ%Gajtf,+Q#htWgQVii78#$KvJiy4z4MtKxS3RP/sGham . make sure to generate your own key . good luck .