When You start you computer a wild massage appear that says ."press f1 to continue f2 to enter setup"
Main reason of this error is that the motherboard of your computer is not saving the bios settings.
Its Diskette drive error which means a disk drive is enable into your bios settings .
Run setup using F1 and try to change date and time make it correct.
Disable Floppy Disk Drive if not installed into yours computers.
then save yours setting usings F10 .
Power off your Computer.
If " Press f1 to continue f2 to enter setup " shows again that means the CMOS Battery is not charged or its need to be replaced .Its Because the all Bios Setting is saved into this cell. The CMOS cell is installed on yours computers motherboard . its look like that
You need to be buy it and change it . you can buy this CMOS Cell from EBAY .