I read a few posts with that issue and most say it is a ram issue and the ram (at least one stick) is bad.
A few other posts said replacement of the CMOS battery fixed the issue.
For the easiest check, remove all but one stick of ram (hopefully you have more than one) and try starting your computer - if that doesn't work try another stick (placed in slot closest to CPU) - see if you can get past that message.
If you do find that you have a bad ram module, I would suggest using Crucial's memory finder tool to get correct replacement ram - here http://www.crucial.com/store/drammemory.aspx
FYI: It is best to replace all ram sticks rather than one - ram is sometimes incompatible just between two different (but alike) sticks.
If that doesn't work then you will most likely have to replace your CMOS battery (it's the little watch battery on the motherboard).