[I open the viewer and just have a black screen. I just installed it and I am using windows 7.]

Well, i just find the solution on that; after 2 or 3 test i bet its the trouble, how to fix its simple;

 

http://www.sevenforums.com/tutorials/140592-hard-drive-turn-off-hard-disk-after-idle-never.html

 

and look your result, mine its perfect since i do that.

[I open the viewer and just have a black screen. I just installed it and I am using windows 7.]

I have the same trouble, and i cant fixe that. Honestly im a little irritating of that.