I'm on a 2003 Dell Latitude laptop. I recently re-installed the Win XP OS from original disks and then uploaded the drivers manually from the Dell site. I also ran Windows Update. The machine worked beautifully for 2 weeks and then all of the sudden at bootup I get the message "Dell Wireless WLAN Card Wireless Network Controller has encountered a problem and needs to close". If I close the message the OS will contiue to boot but it is running very slow. There is also a quiet hum like the HD is turning which I haven't heard before. The computer is so slow that nothing seems to be able to work. It takes several minutes for it to shut down. Not sure where to start on this problem. Do I need to reinstall drivers? Is it a virus? I do not have any anti-virus running. Please advise.