My clock doesn't work

My clock doesn't work on windows 7 Ultimate 32 bit. For example when I turn comp at 19:00 and then on the other day when I am back in the morning the clock shows the same..

Please help what could be done?

richc46
Thanks. Is there any alternative than checking bios battery and replacing?

If there is no alternative than how to check it?

Thanks a lot!
As “ur link” reads: “If your computer seems to "forget" the date and time whenever you shut down, the culprit is probably a weak CMOS battery” – my computer doesn’t forget but it keeps the same time.
I have a home computer for more than 3 years and I’ve never had any complaint. About a month ago installed windows 7 and that time failure appeared. So I doubted whether that was win7 failure or not.
Appreciate ur help

For the wont of a Pound, Euro, Dollar, a new BIOS battery, usually in my experience a CR2032 type, is not going to break even my bank.

As you say "I have a home computer for more than 3 years and I’ve never had any complaint". So the battery is hardly new. I have a 7 year old car, one day it doesn't start, but it was OK yesterday. I still have to walk, catch a bus, until I buy a new bit to replace the old "OK" bit. Things fail and sadly, never on their own, always when you've done something else so to cast that doubt in your mind.

Hi Anak
And thanks to everybody for reply
"Are you comfortable working inside your computer"?
No I am not.. don't have experience but give me clue. I will try to get help from somebody else

So as I see only solution, I should try to replace the bios battery