My PC time and date is automatically changes every time I restart the PC. This is a very old machine and has the below configuration:
Processor: Intel Celeron 2.26 GHz
RAM: Twinmos 512 DDR1
Every time I start the PC, getting a black window with different instructions of hardware components like CMOS checksum error or floppy disk fail. To access operating system I need to press F1 key. Every time I need to change date and time manually. I thought motherboard battery is damaged and already I have changed it but getting no new outcome. Due to this problem my mail sending and receiving time is also changing automatically. How to solve this problem? Is this a motherboard problem or any other hardware problem?