MiKTeX is not automatically associated with files having extensions .tex or .dvi. You need to add these associations yourself. This is good to know how to do anyway, so I encourage you to face this small task with good cheer.
Download a simple .tex file, such as 1.tex. Save it in a folder, perhaps your 592 folder. Open that folder and double click 1.tex, or right click and choose Open with, Choose program. You'll see something like this:
Now we'll tell Windows which program you want to use to open .tex files when you double click them. Click Browse, then find your way to C:\Program Files\MiKTeX 2.7\miktex\bin.
Now find the program texify.exe, and "Open" it.
This takes you back to the "Open With" window. Click the box "Always use the selected program to open this kind of file", so that Windows will always run texify.exe when you double click a file ending with .tex.
Now, when you double click a .tex file, texify will process it and produce a .dvi file. Hopefully MiKTeX has already associated .dvi files with YAP (Yet Another Previewer) because, if not, I'm having trouble making Windows do that. I am also having trouble making it possible to get Windows to run dvipdfm on a .dvi file. Hopefully I'll resolve this soon.