|You do NOT have to reinstall Windows...put the CD away. You know what the problem is, don't make matters worse.|
Make sure you unplug the power cord 1st, then remove the battery for a few seconds. Replace the battery, plug in the power, bootup & immediately enter the BIOS. Change the date/time settings, then load the BIOS defaults. Save the settings & reboot. Enter the BIOS a 2nd time & manually configure the CPU & RAM settings...save your settings & reboot.