Try this,
In the bottom right corner of your desktop, is there a little picture of a computer screen with a couple of "sound waves" coming off it? If so, right click on it and a menu box will open with the choices;
Disable
Status
Repair
View available wireless networks
Change windows firewall settings
Open network Connections
choose view available wireless networksThen look for the comcast network and connect to that.
If Comcast isn't available on the list, you may have to choose and look in your LAN or high speed internet category to see if its listed there. If it is, right clik on it and choose
Remove the battery from its compartment on the side of your Dell Inspiron laptop computer.
Remove the power adapter from its plug on the side of the Dell Inspiron (if your laptop is currently plugged into a wall outlet).
Press down and hold the "Power" button on the laptop for one to two minutes. This will dispel the excess electrical current that is built up inside the laptop.
Put the battery back inside the compartment of your Dell Inspiron.
Plug your power adapter back into the side of the Dell Inspiron. Press "Power." Your laptop computer will now turn on.
hope this helps
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