Well I Googled that error message and quite a few of the results I got said that it was a hardware problem. The main problem was RAM, another person seemed to have a hard drive problem. It's weird because you said you haven't added any hardware lately so I really don't know what the problem is. It's rather difficult to pinpoint since the error message isn't very specific. You wouldn't happen to still have a warranty/insurance on the laptop, would you? If so, you could of course get it repaired that way. If not, unless someone else can help you, you may want to consider taking it to a computer repair store and seeing if they can help you at all.