Videos too dark (help needed)

Hello. I am not very computer savvy, so I can only guess.  Why are night scenes so dark on my computer? It's been like this for sometime, but I put off trying to address it until now.  Since our cable's been off, I've been having to watch shows like GOT & Salem online, but scenes at night are so hard to see.  I watch them in Flash (flv). It's like this in Divx too, but I can't watch it in that format anyway, because the video starts, then freezes, with the audio still playing.

My computer is a Dell DE051 (running Windows XP) with a Dell E773c Color Monitor. I will copy/paste some specs if it will help

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