You also can do this within the Open File dialogue box in Microsoft Word and application programs. You should also learn to use the Search function in the Start menu to locate files by name or even by content. One of the first things users need to learn is what to do when things go wrong. The first rule is not to blame yourself. Things go wrong all the time with computers, and most of the time it's not your fault.
Programs just stop working for no apparent reason.
Sometimes you have no choice but to restart the computer. Even that can be a challenge if the machine doesn't have a reset switch or if the power switch doesn't respond.