Microsoft Windows XP Professional "sentence origin" Questions

...I want to comment in incoming emails being exchanged, by adding my replies/comments between the sentences/paragraphs of the incoming emails ( it's a long discussion) someone said this is called ...

a little porblem "you may be a victim of software counterfeiting" this sentence on desktop..what is that?? I can't use any picture for wallpaper..... system automaticly update from internet. pleas ...

...and turned it on again and suddenly there's a 'you may be a victim of software counterfeiting' sentence. my desktop background become black(no background) even though i had set up my background ...

...problem in my system..... This copy of Windows did not pass genuine validation. what means this sentence obove? and what meas too by this sentence.down The product key found on this computer is a ...