If the LAN is working fine, then the problem may be with your desktop itself, applications, or configuration. For example, if your browser is really slow, try emptying your browser cache or giving your browser a larger cache size (I.E., using IE's Internet Properties panel, click Temporary Internet Files/Settings to adjust disk space). There are a multitude of reasons that applications perform poorly, so what you need to do is narrow your search by isolating which applications behave badly, whether there's a particular time of day that it happens, what you're doing right before it happens, etc.
If all applications behave badly all the time, then you may be looking for a TCP/IP problem, and you should search the knowledge base for your desktop's operating system to see if there are known bugs and patches - for example, there's a patch for Windows XP Home that fixes a fragmentation problem. If just one application is behaving badly, then look at that application's support page and knowledge base for further hints. You might also compare the same application running on your wireless laptop and your wired desktop to see if there are differences in configuration. Finally, try browsing around a PC tune-up Web site like PC Pitstop to find more tips. Good luck!
Dig Deeper on Wireless LAN (WLAN)
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