If you have a slow wireless internet connection that often crashes, then there’s probably something wrong with it. (Duh!) Here are some tips and tricks to fix some of the most common wireless problems on Windows XP. Before you start “fixing” anything, make sure your wireless connection isn’t already at it’s best.  1. Move the wireless router to a better location The first thing you want to do is to make sure your wireless router is in the best location possible. If you have a laptop that you move around all the time or if you have several computers, the router should be in the centre of your home and office. Don’t hide it into cupboards, or under chairs and tables.
But if you only have one stationary computer, use a cable connection to the router or move  the router as close to the computer as possible.
You can check the signal strength from the Wireless connection menu, accessible from Start -> Connect To -> Wireless Connection. You can also access it by clicking the wireless icon at the bottom right corner of the screen if you are connected.
 2. Upgrade the wireless router firmware Sometimes the problem is with the router firmware. Make sure you update your router firmware as often as possible to avoid incompatibility with newer systems. You can update your router firmware from the wireless router control panel. Type your router’s IP address into the browser to access the CP.
The default IP of routers is normally 192.168.1.1 for Linksys, 192.168.0.1 for D-Link and Netgear, some US Robotics routers use 192.168.123.254 and some SMC routers have 192.168.2.1. The router’s default IP address is always in the documentation of the router.
 3. Change the wireless broadcast channelIf there are several wireless networks in your area, they can begin to distract each other. Most routers use the wireless channel 6 by default and the channel can slow down if full of signals coming from many routers. You can change the wireless channel from the Wireless Control Panel.
If changing the channel didn’t speed up your wireless connection, change it back to 6. It’s better not to play with them too much because this can distract your firewall.
 4. Update your computer’s wireless network drivers You can search for driver updates from the Windows Update site or your manufacturers website.
If none of the above tips helped, contact your wireless router manufacturer or just go back to a wired internet connection.