Microsoft recently released a security update for a vulnerability in all versions of Windows. The solution for Windows XP requires ServicePack 3.
This service pack is verified together with PickMaster and is highly recommended together with the Microsoft security patch for the issue.
Information and solution regarding the issue can be found on the Microsoft web site:
http://www.microsoft.com/technet/security/Bulletin/MS10-046.mspx
and:
http://www.us-cert.gov/control_systems/pdf/ICSA-10-238-01A%20-%20Stuxnet%20Mitigation.pdf
/Mats