Installation shows error while installing SolidWorks 2012

Hi,
I am trying to install SolidWorks 2012, student version on my windows 7, 64 bit machine. I install proceeded till 29% when it stopped and threw out an error “RollbackUnReg_DocMgrDLLxxxxxx”. I uninstalled the program and installed it again and getting the same error on another percentage. I tried to get the correct Visual C++ Redistributable x64 package and installed but of no joy. Please help.

SolidWorks Installation Manager
Internal Error: The Windows Installer for this product component did not run as expected: RollbackUnReg_DocMgrDLL.xxxxxxxxxx.
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