BIOS Setup Reset after each night

Hi,

I am currently using Windows 7 64 Bit Ultimate and my hardware configuration is as follows but really facing a strange problem from past 2-3 days.

Hardware Configuration

Motherboard: ASUS M4A88T-M
CPU: AMD Phenom II x4 965
Graphics card: ATI Readon HD 6670
Harddrive: 500 GB SATA (OS resides)
2 TB Sata

My BIOS settings is going to be default after every night including date time and boot priority reset.So when I restart my computer, i have to change the BIOS(save and exit) regularly and then when I restart it again , there is no problem at that day but in the next morning, everything is reset and again, I have to manually reset it.

My BIOS default settings:

BOOT Option:
1st Device:2 TB SATA
2nd Device:500 GB SATA
Date: 01/01/2002

So everyday, when I start my pc, I need to change it quite often. Please help me. Many thanks

Have you tried changing the CMOS battery?

Nigsy said:

Have you tried changing the CMOS battery?

No, I'll try changing it, ok! Thank you:)

Ok, Now it's working fine, thanks for your help guys :)
Closing the thread right now.