Cmos Checksum Error?
 

Okay, so I open the computer and I get this at the very first start-up screen:

CMos Checksum Error- Defaults Loaded

Screen stops, and then I have to press

F1 = continue

Anyone know what's going on? I did a Add-Aware and Spybot scan BEFORE I shut the computer off...

You either took out the cmos battery at one point or the cmos battery is dying and needs to be replaced.
Luckily they're not hard to find just mention it to any electronics shop and they'll point you in the right direction.

oh, since I didn't take it out... then it's just dieing... never knew about these things (first time I see it)... is it easy to replace?

Guessing it's not a virus or anything... that's good...

Yeah, its just a button-like battery that's located on the motherboard. You can find the battery at just about any outlet or electronic store. If you are going to replace it, it may help to take out the battery and show it to a technician so they know which battery to sell you.

Edit:
They usually look like this.
http://img.photobucket.com/albums/v6...mosbattery.gif

Evern better. There are external batteries connected to mother board (they are like a little box and a simple wire to connect). They're better than normal batteries 'cos they recharge on each switch on. Mine cost me 12 euros (maybe a little expensive, but cheap for never having the problem again :) )

Ah right, so this explains everything for me.

If my computer is unplugged from the power sockets for 20mins or more, I get this error. I always just ignored it and re-setup my BIOS =\

It's a common problem, just try running without a CMOS battery. I had to set the goddamn system time every single time I decided to power on my PC.