Windows Clock Issue

[Twinblade]

Every time I switch on my PC the clock has reset itself back to some date in 2001 and the time to 11pm. I check the BIOS on start up and it displays the correct time/date.

How do I stop this happening?

 

[Twinblade]

Just to clarify, the BIOS is retaining the time? i.e. it's not the battery?

Yeah, BIOS has the correct time/date, and when I load Windows the time/date is wrong.

 

[Twinblade]

What does it say in control panel > regional settings. Is that set correctly?

Set correctly.