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If it came with the install disc you will need to use it, also, (newer computers will detect the software automatically) you must sync your key board with the mouse.
#1 press the connect button on receiver
#2 Press the connect button on the mouse
#3 Press the connect button (again) on the receiver
#4 Press the connect button on the keyboard...
Try resetting the mouse with the receiver. Press the connect button on the receiver and then on the mouse.
Also, make sure the light comes on the mouse when you install the batteries, If not, they may not be making contact or be in correctly.
The problem was that ther keyboard was encrypted for my protection. this sometimes prevents the keyboard from connecting to the receiver and therefore the computer. to stop encrypton: press the left CRTL + left ALT + F12 key at the same time. Press the connect button on the receiver (you only have a few seconds to then press the connect button on the keyboard. Press the ESC key. Now you must start the encrypton again. Install SetPoint software from www.logitech.com/downloads. after you save and run the program, then press left CTRL + left ALT + F12 keys. sometimes there is an encrytpion wizard that pops up to help you further encrypt the keyboard, but this does not always pop up. It didn't on mine. My keyboard just started working right after i re-sarted the encryption.