|That seems to be a cpu microcode error message. The bios is saying it doesn't know how to support that cpu. Did you just change the cpu or are overclocking it? If so, check Asus' site for a bios upgrade.|
If it just started happening with no hardware changes then, as already mentioned, check the cmos battery. Or sometimes clearing the cmos will fix it. You can check the manual on how to do that but generally:
Remove the power cord and open the case and locate the 'clear cmos' jumper. Jumper it to the 'clear' position for a few seconds and put it back in the standby position. Some Asus boards just had a 2-pin clear cmos. In that case there is no 'standby' position. So just jumper the pins for a few seconds and remove the jumper. Other Asus boards had no pins but just 2 solder joints. Sometimes you could use the points of a needle nose pliers and touch the joints to clear it. Or removing the cmos battery for awhle should clear it.
On first boot up after clearing the cmos you should get a date/time error. Enter cmos/bios setup and update those settings.