Hi everybody I was wondering if you could help me out? I have a windows XP home edition operating system. I've been tinkering with the command prompt recently, just seeing what i could do with it. It seems like a useful tool, and ultimately I wanted to be able to, say, diagnose and eliminate/repair programs which are slowing down my computer. Or track down and murder viruses. I dunno. Are such things even possible? That is not the point. The point is, when i look up command references on the internet, there are a whole bunch. Then i go to the command prompt on my computer and type one in. Take driverquery for example. C:\documents and settings\user account\driverquery [presses enter] 'driverquery' is not recognized as an internal or external command  This happens with a fair amount of commands. Why wont my machine accept them? Is there anything I can do to make my machine accept them? I would really appreciate the help.