Document "poof!" gone! What happened?

[liunx]

I was creating an .html form in notepad and all I did was remove (or add, forget which) some table tags then save it and now windows won't let me view the document! As soon as I hit save "poof!" the document disappears, I get error messages and my system freezes. After I reboot, I look in my documents to see if it's still there and it is but I get more error messages when I try to open it. What the hell is that?!!<!--content-->nevermind. restored it. {whew!}<!--content-->