With document ID c02928162 on 2010/07/22 an advisory for HP Data Protector 6.1X and Data Protector 6.2 was released, describing a problem with high memory utilzationwhen using on Windows 2008 R2.
There is a solution which can be requested from Microsoft, in the article you find the corresponding links.
The complete advisory can be read here: http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=c03117812&jumpid=em_alerts_us-us_Dec11_xbu_all_all_1535092_102288_software_critical_009_0