There is definitely some conflict somewhere.
Is this laptop? How is it connected to the internet? Built-in network card? What type of connection is it?
If this is high speed internet, is modem disabled?
One thing worth trying would be to reinstall network card driver.
Also, search your computer for npkcrypt.sys file, and post its location. Before search, make sure, hidden, and system files view is enabled
1.Yes it is a laptop.
2.Built-in network card
3.Comcast cable
4.modem is enabled
5.Not so sure how, my router is WBR-1310 [D-link]
6.The file npkcrypt.sys could not be found, Hidden is viewable.