With the document provided in the link below on 2012/01/25 HP released a Routine Alert for HP Data Protector 6.21, which provides a script to uninstall Patchbundle 6.21 for Windows when needed.
The complete advisory can be read here: http://h20000.www2.hp.com/bizsupport/TechSupport/SoftwareDescription.jsp?lang=en&cc=us&taskId=135&swItem=im-101667-1&jumpid=em_alerts_us-us_Jan12_xbu_all_all_1593010_105727_software_critical_005_38