If the connection difficulty seems to arise only when you're rather far away from your wireless router, the problem could be that you're on the fringe of the router's coverage zone. The simple way to fix this is to buy a router with better range, but you can take some other steps before going to the trouble (and expense) of buying a new router. First, make sure that your router's antennas are securely attached and are positioned upright. Next, confirm that the router isn't buried or blocked behind large objects that might cause the signal to degrade faster than it normally would. For best results, place your router out in the open so the signal can travel freely.
If you still aren't getting the Wi-Fi range you'd like, consider moving the router and the modem to a more central location within your desired coverage area. Of course, your placement options are limited: The router must be near another cable or telephone jack. Most cable modems can plug into any cable outlet, and DSL modems usually plug into other telephone jacks--but remember to switch out any filters that might be attached.
Restore the Router's Settings to the Factory Defaults
If you continue to have trouble getting various computers and devices to connect to your router, you can try restoring the router's settings to their factory default values. Unfortunately, this wipes out all of the settings, so you'll have to secure your home or office Wi-Fi again, and you may have to reconfigure your Internet connection settings. When you're ready to restore the router, find the small reset button or hole on the router's back, and use a pen or paperclip to press and hold the button for at least 10 seconds.
Reinstall the Wireless Adapter Driver or Software
If after completely resetting the router, you find that connection problems involving a single PC on your Wi-Fi network still haven't gone away, consider reinstalling the driver and/or software for the Wi-Fi adapter on that PC. The first step in this process is to download the latest network adapter driver or software from your computer manufacturer's website (or from the site of the adapter's manufacturer, if you purchased the adapter separately). From there, carefully follow the manufacturer's directions for reinstalling the software on your adapater. Reboot your PC afterward, and you should be good to go.
Upgrade the Router Firmware
If connection problems survive the reinstallation of your network adapter drivers, ityour router may sufer from a technical issue. Router vendors typically release firmware updates for their routers to fix known issues and sometimes even to add new features.