Why won't my Internet work on my Dell laptop?

I have a Dell Inspiron M5030 laptop with Windows 7. The Internet was working for a while and either something came unplugged inside or some connection isn't working. My iPhone and my sisters laptop work fine. I also tried to speed up my computer and uninstalled some things. I may have accidentally uninstalled the Atheros adapter. But when I go to check, it's there she times and sometimes not. Any help? Thanks!

Added (1). Thanks what do I did from there? And I have a wireless connection.

Try unplugging

Click Start -> type Device Manager in the box and hit enter.
Click on any entry on the list, then go up to Action, then pick Scan for Hardware changes.
How do you connect to the internet? Wireless or wired?

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