Every time I open my computer it always bring me to set up not to my os.?

I am always requested to press F2 before xp starts. when my comp starts date and time is always incorrect. How can i stop this from happening? Is my infected with a virus or malware? I am using agv as anti virus and anti spyware programs but ive scanned my comp using these and there were no viruses or malware ,spyware found. pls. help me with this.

Every time I open my computer it always bring me to set up not to my os.?vincent

How old is your computer? There is a small battery which enables the motherboard to hold the basic settings. If this is old it may need replacing. Try asking someone at your local computer shop to test it for you.