Autodesk Inventor 2011 Error 1402

Hello
Recently I've downloaded Autodesk Inventor Professional 2011 and tried to start the installation.
I inserted all of my details and organized all the choices. But when the installation really starts, it gives the following Autodesk Inventor 2011 error message.
Please help.
Thanks.

Error:
Error 1402. Could not open key:
UNKNOWNComponentsE6B0E3CFB26F1D111844000CF499BOB2195DD4F746519040000017707DF0D34B. Verify that you have sufficient access to that key, or contact your support personnel.
