B85 HD3 BIOS swap prompt

[KingChicken]

Hello!

First of all apologies if this has been asked already, I have searched through quite a bit of posts but could not find threads with this particular problem - that or I can't seem to find the right words to describe my problem because I am not a native English speaker.

System
OS: Windows 7 64 bit Home SP1
RAM: 8 gb Crucial RAM
Motherboard: Gigabyte B85-HD3
Processor: Intel i7 4770 3.4 Ghz
GPU: AMD HD 7970 Ghz edition
HDD: 1 TB Barracuda

Background (this may or may not be relevant)
I have had this computer for about three years and about the first year it was plagued by BSODs alot. I then flashed and updated my BIOS and that seemed to have helped the problem. About a month ago everything went down hill. Everything stopped working after the Windows 10 transition. And after that I couldn't install Windows 7 again. It turned out the SSD I had first installed was corrupt, so I ditched it. Computer has run stable since.

Problem
Last sunday the BIOS gave me a prompt on startup if I would like to "swap the BIOS". I read there are Gigabyte Motherboards with dualBIOS, so as to backup the main BIOS. But as far as I'm concerned, it's working correctly. I can choose 'okay' or press the cross. When I press the cross the computer boots up normally. After that it didn't ask it anymore until today. The prompt was back. It doesn't impact my computer use at all. Every file is still here, everyting works. I can game without a problem. I would just like to know what is going on. I'm too scared to press 'okay' (or do anything really) because I'm not sure what it's going to do.

Thanks in advance!

PS The next time the promp appears I'll make a picture, but it's just a blue-ish screen with the prompt in the middle of it.

[dmdilks]

Have you tried a new battery?

[KingChicken]

Thank you for taking the time to help me.

When I click the cross, the computer boots up normally and without problems. The date and time are also still displayed accurately.

What would be the reasoning behind changing the CMOS battery?

[dmdilks]

Ok have you tried the turn off the computer and unplug it. If you leave the computer off and plug in. You will not lose the time. If you unplug the computer than it will lose all the settings if the battery is bad. A weak battery can cause problems.

[KingChicken]

Every night we switch all power to the computer off via an extension cord with a power switch. The date and time have always been accurate. Though I have googled it and some symptoms do describe some weird problems I had as of late. Also, I had always told my computer to never go to sleep mode, because it wouldn't wake up, but a few weeks ago it went into sleep mode (could wake it up though!) and I saw the setting was changed, all by itself. Could this be CMOS battery related as well?

I'll enter the BIOS tomorrow and see if the date and time are correct before it connects to internet.

The computer still hasn't done it again (booted up perfectly fine twice since I created the topic), so I am not able to provide a picture of the prompt in question just yet.

[dmdilks]

What ever the time and date you have in windows is the same in you bios. If you change the time and date in windows it will change it at the same time in the bios.

[BlackHoleBox]

Is Windows time even a reliable means of troubleshooting anymore? Pretty sure date/time, zone and DST settings default to automatic online retrieval.