Internet Works On All Computers But One After Resetting The Router

we hadn't have the WEP key on our Linksys wireless router, so we decided, about a month ago, that it was a good idea to lock our wireless connection. So we did. For a couple of weeks, everything worked just fine.But then we bought a new printer, which happened to be a wireless network printer, and in the process of installing it, we mistook the reset button (I think) on the router for some other button and ended up resetting the router. When we did that, we undid WEP key, thereby unlocking the router. Then, we locked the router again, at which point one of our computers--which happens to be mine--ended up not working. All other computers and phones and iPads work just fine, but this one laptop of mine just doesn't work (with respect to wireless internet connections, of course).

- pressing the reset button on the router again. It kind of works. The internet works for about five or ten minutes (which is unbearably annoying because I have to reconnect it every five minutes), but my computer somehow disconnects itself from the internet connection. Also, although the internet technically "works," the wireless network icon thing on the bottom right of the screen has an "X" on it, which I thought meant the internet is not working, but it apparently doesn't, because my internet is working now. And, if I click the icon, it says that I'm not connected, but, again, the internet works. (for about 5~10 minutes, if I unlock the router)

- changing the internet protocol information (I don't think it does anything, but.)

- changing the wireless internet connection property to WPA, WPA-PSK... everything.

*All computers in the house have wireless internet connections but mine.

*When I reset the router, the internet works, although the computer says it isn't connected, and it disconnects itself every 5 or 10 minutes.