I had an XP machine using a wired connection with a Linksys WRT54GS 2.4GHz router. The only things connecting to it wireless were my wii and my PS3 which were in the next room, less than 15feet away. I purchased a Windows 7 machine for my wife for Christmas, and gave the XP machine to my kids. I moved the modem and router into the kids playroom, and set the Windows 7 machine up for wireless. Now the router is at one end of the house, and the 7 machine is about 45 feet away. The signal strength was never an issue until last week, and now the PS3 and the Win7 machine constantly have weak signal or no signal. I don't know a whole lot about networking, so please be gentle. I am willing to move the router and modem to a central location as a last resort, but would like to keep them with the XP machine for our kids to use. I am not going to spend money on a wireless card for it. Thanks in advance!