I have 3 computers running XP, one running Windows 7 and 3 smart phones all connecting to a Netgear JWNR2000v1 Wireless- N 300 Router. All of them connected fine until about a month ago the XP machines all started having problems, until finally none of them would connect or could even detect the router at all. The smart phones and Windows 7 computer have never had a single problem connecting. My daughter has tried to use one of the XP machines at some coffee shops with no success, I assume they are "N" networks. I pulled out an old "G" router and they can all connect to that one without a problem. The XP machines are all different, one Compaq, one Dell, and one Toshiba. None of them have any detectable viruses, using Eset and Windows Security Essentials. Any ideas?