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The RTC battery is a rechargeable Li-ion "clock" battery that's buried underneath the keyboard - it keeps date and time going when your computer is turned off. If you're getting this message, you should go follow the screen prompt, hit F1 to enter Setup, and set the date and time, leave the computer on for several hours to charge it (the clock battery recharges only with the computer turned on) and it should go away.
In the rare event that your RTC battery is bad, it's really up to you as to getting it replaced or not - it's a lotta work, and not all the battery vendors out there is competent enough to sell you the right kind of battery (installing a non-rechargeable Lithium battery will kill the thing outright, and there are actually people selling these....). Not having a working RTC battery doesn't really interfere with the workings of the computer - you'll just have to set date and time every time you start it, and you can do so manually or by downloading some freeware such as Atomic Clock Sync to automatically do it for you.
It sounds like your CMOS battery is dead. The CMOS battery keeps the date and time current as well as your BIOS settings when power has been turned off to the system. Check your system for the current type of battery your Toshiba uses. It either uses a disc type of battery that sits in a socket, or it has a disc type that is in a covering and attaches to the motherboard via a small cable.
The RTC (Real Time Clock) battery charges when the computer in on (operating). You can plug the electrical cord in and let the computer run for 24 hours by temporarily suspending any sleep mode or automatic power saving features. This should sufficiently charge the RTC battery.
On your motherboard you have what is called a CMOS battery(usually a-3V Lithium cell).It is what keeps your CMOS data and your clock intact when your pc is powered down. It has got a life span of about 3 years. So I suggest that yours should be replaced ok. If you cannot open your system unit to locate this battery, do call a technician. It's simply and straight forward. Good luck
i would recommend a fresh install of windows and if that doesn't solve your problem then check that your processor isn't loose and while you check inside the laptop give it a good hoovering to get rid of any dust. i think maybe it freezes because it gets too hot so i would recommend hoovering inside and buying a laptop cooling platform off ebay (fans that the laptop sits on.