Documents disappear.

This has happended twice. When I double click on doc in
folder for Quattro Pro 10-[C:\Documents and
settings\O...\Client list & Follow Ups-QPW(Unmodified)
the screen "border" for the document appears with the
name on top as listed. But the document itself is
missing. I see the desktop and all items in the desktop
area are frozen. Where is my Client lists and follow-up
document? If I print it, the actual document prints
out. Why has the form disappeared on my screen? Thanks