Interestingly, I received two phone calls and another email today all regarding the same subject. Upon starting their computers, these users could not move their cursor around the screen…despite repeated attempts. It turns out that in all three cases, they were using cordless mice. Cordless mice talk to the computer via radio waves to a receiver attached to the computer. Since they are cordless, they can't get power from the computer (like corded mice do) so they get power from batteries. Some mice use AAA batteries, others use AA. In all cases, these batteries need to be replaced from time-to-time. In these three cases, replacing the batteries restored order to their computing lives. Batteries can last up to four or five months in some cases, but two to three months is the norm.
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Any decent wireless mouse software (i.e. Logitech) should have a battery power monitor that you can check periodically also…
(that is, if you happen to load the specific mouse drivers and not just use the Windows plug & play default)