Intel Wifi Link 5100 AGN Not connecting

Hello

I have a Intel Wifi Link 5100 AGN wireless card that isn't working properly. It will connect at first, then the connection is dropped. This started happening gradually, then became more and more frequent. I tried reformatting my computer, and this still is happening. When I use a wireless USB adapter, the computer has no problems using the wifi. I'm pretty confident that my network card has failed/is failing/might have short circuited somewhere, but does anyone else have any ideas?

I called dell about it, because I have the extended complete care warranty. However, they insisted that it's a software problem and that I have to pay $100 to get it fixed. If I pay them the money to fix "the software problem" and that doesn't work and they determine that it's a hardware problem, will they refund me the money I paid for their software warranty?

Thanks!