Windows XP has a command line utility which will help you determine if you have spyware or botware running on your system. Netstat displays protocol statistics and current TCP/IP connections.
I use this utility as a test, to ensure that the anti-malware tools and firewall running on my systems are functioning correctly, and that there are no open outgoing connections to the internet that I am not aware of.

You should close all open programs before you begin the following process, if you are unsure which ports/connections are normally open while you are connected to the internet. On the other hand, if you are familiar with the ports/connections that are normally open, there is no need to close programs.
Subscribe to MakeUseOf and get daily updates about new cool websites and programs in your email for free. Plus get free cheat sheets to your favorite programs.