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if you have a virtual keybaord please open it and look if the keypad numlock is on specially if you are using kaspersky product it has virtual keyboard feature, if you dont have virtual keyboard please insert an usb external keyboard on your notebook and look if the numlock light is on, if it is turn on turn it off and remove it.
check the bottom of keyboard and wireless pickup device..lights should be steady on..if not, reset with buttons..also, check battery charge, by replacing battery..also re seat the wireless pickup into another usb port.
go to the Averatec support driver page and download new drivers for the USB. Sometimes these are listed as "chipset" drivers, which is a set drivers bundled into one. below is a link to where you can download files
you can order new keyboards for 20-35 dollars offlineand its a simple procces all you need is a small screwdriver (phillips) and about 5-15 minutes depends on how familiar you are with your hardware shoot me an email at firstname.lastname@example.org and ill send some pictures guiding you if you want
I can't find step by step instructions for dismantling your laptop (I found them for a Toshiba), but in general the CMOS battery on any PC is on the motherboard (this includes laptop motherboards). You'll have to take the system apart, including taking the keyboard out, etc. etc. to get to it.
Take a look at how a Toshiba 6100 is taken apart for an example:
It's not for the faint of heart so I'd recommend taking it to a local repair shop ...