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Do you have any 2.4MHz cordless phones in the house or is the computer near a microwave? those two items can cause interference. You can go to Dell.com, go to support then download drivers/software, enter in your service tag is best if you know it? find the network card driver and download it. You can find out which NIC card you have by going to my computer, system, then device manager and right click on the NIC, then properties, it will tell you what card you have.