I was having the same problem with my u56e asus computer. I tried for hours to reinstall the wireless card driver and any updates that I could find. The computer would randomly connect and then it would not recognize the wireless card was there at all. Eventually, the computer would not connect to the internet at all. Of course, I ran many virus and adaware scans as well. Finally, I ordered a new wireless card after reading that this resolved the problem for someone else. However, when the card arrived and I took the computer apart to install the new card, I realized I needed to order the half-mini card instead of the full mini card. While I had the computer open and everything apart, I cleaned the fan, and the dust out of the computer. I took the wireless card out and re-snapped it back in as well. Once I put the computer back together, I was shocked that the wireless card was working. I remained on the computer and surfed the internet for several hours to test the wireless, it continued working and is still working today. I can go to the furthest point in my house away from the router and it has a strong signal. This has been my son's computer for 3 years. He gave it to me several months ago because he said the wireless would not stay connected. I believe the problem was that either the card had gotten loose and I tightened the connection when I reconnected it or the fan was sticking and causing the card to overheat and not work. Either way, I am just glad that this computer is now working fine. My suggestion is to take your computer apart, their are videos on youtube about how to do this properly, clean out your fan and other dust in your computer with q-tips and maybe a little alcohol, un-connect and reconnect your wireless card and see if this helps. By the way, I know that in the past we have had hard-drives burn up or work improperly when the fans became dirty. I usually take our computers apart about once or twice a year to clean the fans. I have even replaced faulty fans from time to time.
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