it may have damaged some registry keys when you removed the program. try downloading and runing this small program, it resets the host files, dumps dns cache patches reg keys and renews your ip. http://www.snapfiles.com/get/winsockxpfix.html
if that dosent work, try uninstalling the wireless card's driver and utility, rebooting the machine, then re-installing the driver. if you have win xp sp2, you may get better results using the windows zero wireless utility built into your operating system. depending on your hardware.
post back with any issues