Why doesnt wifi signal show up?

Why doesnt my laptop with a wireless USB drive connect to my wifi connection?

Since my laptop doesnt have a wireless card, i got a wireless USB for it. The problem is that when it tries to find connections, mine doesnt show up. Even when i place my laptop next to my router, it still wont pick it up. At times it does show up, claims to have a low connection, and tries to connect but it then disappears again and doesnt connect after all. What should i do in this situation? Nothings wrong with the USB and it is compatible with my wifi so whats wrong?
Answer:

It depends what wireless adapter you have. I had a Netgear and it did the same thing with my laptop. well the problem was with my computer. I had to fix it a little (sorry can't remember what exactly did to it). you probably did that already, but restart everything in order. modem wait, router or wireless wait, then try computer.

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