I have a refurbished Optiplex 755, Windows 7 pro 32 bit, 2GB RAM. I want to install 64 bit Linux so I got 2 new 2GB memory sticks and replaced the 2 1GB ones, into the same slots. When I booted up I got a message "unsupported memory configuration. Please, populate DIMMI."

So what do I do now? Is there a solution?