In our office, everyone has a private computer but I am noticing that it may be used by someone else after I go home. So I need a type of remote spy software to monitor my business computer. I know there are many choices for spyware in the market and it difficult to tell which one works best. Some acquaintances recommended me keylogger for PC, but I have no idea about it. Can anyone give me your other suggestions? Both free and purchased ones will be OK. Better for free.