Installer Steam
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Maybe you can try it later.
update direct x
http://www.microsoft.com/en-us/download/details.aspx?id=35
reboot computer
set L4D launch options try: -novid -lv -sw
That should be windowed mode
right click game in library - properties - verify game cache integrity
i don't think nvidia needs Microsoft dot net framework, but AMD does - You can try updating it. I'm sure you have other programs that use it.
http://www.microsoft.com/en-us/download/details.aspx?id=17851
I tried everything you suggested but unfortunately it didnt work. If you have any more suggestions i would appreciate it. Thanks for trying though