My wireless optical mouse stopped working in a week

Battery is getting weak or you have some dust/lint on the optical sensor.

must have enough battery power.
dont put any usb device beside it

This can happen when the battery's are starting to die. Replace the batteries and then test the device again.

YOur mouse needs to be paired with the transceiver. THere is normally a button on the part which goes inot the laptop. Press it once then flip the mouse and press its button once. It will then work hopefully :)

If you are using window you can download the software at:

http://www.microsoft.com/hardware/download/download.aspx?category=MK

Choose system and select wireless optical mouse

I would have suggested opening up your old mouse and cleaning the right click button first.

Generally, wireless devices have a connect button that finds the frequencies of the devices. On the receiver press this button, then press the button on the bottom of your new mouse. the receivers lights will stop flashing once connected.

This should solve your issue from keyboard not responding..

http://logitech-en-amr.custhelp.com/cgi-bin/logitech_en_amr.cfg/php/enduser/std_adp.php?p_faqid=9527

have you changed the batteries recently? Wireless mice seem to eat batteries faster. I have a Dell wireless mouse. It will work fine for months and then nothing. That's when I know to change out the batteries. If your batteries are fresh, make sure they are seated in their slots securely.

have you tried pressing the connect button on the reciever then on the mouse so it picks it back up again?

Some mice eat batteries like they are nothing. I myself have a logitec wireless mouse and i must replace the batteries every two weeks. I would suggest getting another mouse.