Please follow the following steps.
First try to disable(not remove) nvidia firewall and Go to the program folders where nvidia is installed possibly in c drive programs.Delete all the folder.It might not be a complete delete but try.
Press windows buttton+R .Now run prompt will appear.type in msconfig.
This will open the system configuration utility
Go to the last header that says startup, it will list everything that starts up automatically when you turn on your computer, then just turn off/delete the nvidia firewall from the list, click apply, ok etc.
Now press restart latter.
again Press windows buttton+R.Type regedit
Just delete the registry file located here:
Now restart your computer.You should have no firewalll.
If it still doesnot work you have only one choice,installing another firewall over nvidia firewall.I would recommend Zone alarm or Bitdefender.
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