It could be case your computer is being used by some other people, and you may like to monitor what they are doing or what information or conversation they having through your computer. In such cases you can use the free software which allows you to track or record what ever being typed by other users in your absence.
Hooker is a light weight keyboard spy program which lets you capture the keys press action, it has stealth mode, log encryption, capturing of clipboard changes and currently used process, log viewer. However public version has several limitations like program shows it-self when started; stealth mode is deactivated when hot key is pressed (without password prompt).
As this program records the key press action, it might get reported as malware, spyware but it does not send the recorded data to anywhere including author. This application works on all the windows operating system including windows 7, we have just tested it on windows 7 32 bit Ultimate Edition