When you safely remove the Belkin USB wireless adapter, are all devices connected to other USB ports available and working? Including your CD drive?
Did you install the Belkin software before you inserted the wireless adapter into the USB port?
Are you maintaining the Windows XP operating system by visiting Windows update and downloading the latest "high-priority" updates?
Is your malware protection up-to-date? When's the last time you ran a malware scan on your computer?
What firewall are you using on this computer?
Please answer all the above questions with as much information as possible.
Here's a link you may want to read:
Malware Guide