Netapp DSM error " "Internal Error: Access is Denied" during installation on Windows 2008 R2

Today i have faced this error while installing my DSM on one of my windows 2008 R2 server i was scratching my head to find out the reason as the same user account worked well with SNAP DRIVE installation on the same server but DSM failing with Acces Denied Error , Later after checking with netapp i found out this was a bug and has to follow work around to fix this

Work Around 

There are two workarounds for this issue:

1) Run the installation from an elevated command prompt.  This is done by clicking

 Start, then right-clicking on Command Prompt and selecting "Run as Administrator."

 Once presented with a command prompt, you may execute the installation package

 by navigating to the directory containing the package and entering it on the 

 command line. 

C:\desktop> msiexec /a  <netapp Mpio Pkg>

/a  --> to run the installation as Administrator 

2) Disable User Access Control.  Administrators can do this by going into the

 Control Panel, selecting User Accounts, then "Turn User Account Control on or off".

 In the next dialog, uncheck the box stating "Use User Access Control (UAC) to help

 protect your computer" then click OK.

Please Note :- Modifying the second option requires a reboot
And Of course you must reboot once done with you installation for your NETAPP MPIO to detect your LUNS.

Netapp Reference link :- http://support.netapp.com/NOW/cgi-bin/bol?Type=Detail&Display=312358