Not really a BIOS problem more of a software problem. You will need to bring up task manager and end task on any programs that you do not need to run. For more information on how to fix this you should post to the board for your version of windows for support.

go to the start button left click then go to run type in msconfig then go to the start-up tab then uncheck all of programs running in the back round that are not needed. make sure to leave you antivirus running and taskmon, system tray this will return your memory back to be used by the machine. if you find that you have turn off something you just go back and turn it on good luck.