Re: Windows 2012 compatibilty with HP DP 6.20 ??

The support matrix for DP 6.2x

     http://support.openview.hp.com/selfsolve/document/KM1134004

(Click on the PDF document for 'Support Matrix: Platform Integrations)

does not show support for Windows 2012 either as a Cell Manager, Installation Server or a Client.  You would need to install DP 7.  Support matrix is at:

    http://support.openview.hp.com/selfsolve/document/KM1357659