I have a Dell Inspiron 1545 laptop running Windows 7 64-bit. It had 3 GB of RAM, and I just upgraded it to 8 GB of RAM (Crucial CT51264AC800.M16FC 2x4GB PC2-6400 DDR2-800). According to this thread, some people were able to upgrade that same model laptop to 8 GB without problems.
The computer booted up and Task Manager showed that it was using 8 GB of RAM, but the wireless icon in the system tray indicated that it couldn't connect. I tried the Windows wireless troubleshooting feature, and it said that the wireless capability wasn't turned on. But there's no wireless on/off switch on this laptop. I tried restarting Windows and the wireless still couldn't connect. Also, the Task Manager showed a svchost.exe process taking up over 50% of the CPU and over 1 GB of RAM - not sure what that was about.
So I removed the 8 GB of RAM and put the old 3 GB back in. When Windows booted up, the wireless connected fine. That means I didn't accidentally disconnect any wires on the wireless adapter.
Why won't this laptop's wireless connect when it has 8 GB of RAM installed?