http://support.dell.com/support/down...2&fileid=91377
That link should start downloading the specific BIOS update for your machine. You need a floppy disk to install it. Once you make the disk, put it in the machine and restart. DO NOT turn off the machine or unplug it while the update is going because you could really mess some things up. BIOS updates can make a world of difference in performance and everything else.