Has Windows XP professional on it. Recntly, that is this morning, when I tried to boot up the computer, it goes past the splash screen and then gives me an error 'Windows NT has found only 500K of low memory. 512K of low memory is needed to run Windows NT. You may need to upgrade your computer or run a configuration program provided by the manufacturer'
What does all this mean, and why did it happen suudenly and how do I fix it