I have a Gateway computer (T-Series) with Windows Vista. I have a TP-Link Wireless Router. I live in Ecuador and use the most popular internet company here (TV Cable). A few months ago my wireless stopped working. I can connect directly to the internet by connecting to the modem, and I can also connect by using ethernet cables (one going from the modem to router, and another going from router to my computer). My computer will connect at my job but it won’t connect at home and it wouldn’t connect at a shopping mall either. At first I thought it was because at work it’s a secured network and at home and the mall it wasn’t. So I came home and put a password on the TP-Link. Still won’t connect. It asks for the password, but then says it cannot connect. When I click on Diagnose Problem, Windows tells me that the "Wireless association failed due to an unknown reason." I’ve tried changing lots of settings in the TP-Link thing and nothing seems to work.

Help?
I also added more security options to the TP-Link adding the firewall etc. First responder, thanks for you answer, but it wasn’t really answer. How would I do what you suggested so vaguely??
And I don’t move from one location to another, I only did it to test if it was my computer with the problem or the router. The connection stopped working out of the blue for no reason I could tell. Other people can connect to the wireless router with other computers and my computer can connect to other wireless routers. MY COMPUTER CANNOT CONNECT TO MY WIRELESS ROUTER. Can you help me with that specific problem?
I have done that. I’ve reset, rebooted, and re-set up the wireless router according to what TP-Link says I should do and any information I could find from Windows about how to connect.
What security settings are you using for wireless? — Everything is enabled that TP -Link lets me enable.

Update:
Do you see the SID/network? Does it connect?
or does it give an error.

As I said in the original question, I can see the network, I can click to connect, put in the password, and then an error message comes up. Which is included in my original question.

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