The channel (we can change), the hidden SSID drop, MAC filters and more. Your post is too light and much has been covered in the Networking forum. And nothing will correct coverage or distance issues or rather some think a driver or setting will correct such.
Again, too light on details.
I have XP pro on my laptop and a wireless connection to my Mac based TimeMachine. What I notice is that the connection is constantly dropping and reconnecting. The only way I can get a constant connection is to turn off my Win firewall. The Wireless connection is a WPA secure 13 character connection, so I don't think I'm in danger of a breech? Or am I if I go on the net? The TimeMachine is DHCP and is connected to a cable modem router...
My XP is a Compaq presario x1030 with Intel Centrino wireless chip. I have used a Buffalo Wireless G PCMIA card but it seemed to be having the same drops. I don't know if disabling the ZeroConfig in WIN helps or not, but I used to have better luck using Buffalo's software than the built in zero config. Now nothing seems to work well...