should just be a flat cmos battery . they are located on the motherboard, on newer boards (>1995) they are round silver battery's which pop out. simply replace this and you should be in business. on older PC's you may have a battery which is soldered onto the motherboard easy enough to replace with a soldering iron. Before you do any of this go into your system BIOS ( del key at startup) and note/print down your hard drive settings just in case.
Rob is right, but....before you break out the soldering iron, if you have a battery that's soldered to the board, there is usually a 3 or 4 pin header that allows the connection of an auxillary battery after you change a jumper to disconnect the on-board battery.
these replacements can be found at most computer stores both the flat CR2035 types and the prewired type.
Don't forget the network. If you are logging into a network there is a chance the network servers are forcing the time back onto you. On two occasions I responded to a clock problem where the user changed the time only to log into a server and see the time changed back.
If you are not on a network then I agree to check the battery. But if you are on a network I would first check to see if the network is resetting your clock when you log in.
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