Hi Igor,
Thanks for your response. Here are my answers for your questions:
⇒ Did you try to run as "Administrator" Symantec_Install_Package.exe ? (If UAC is enabled)
Yes. UAC is disabled before running this.
⇒ Did you try to re-create same CMS 7.1 on Win7 x64 and install it again on Win2008 R2 x64?
I created the package on noth Win 7 X64 and x86 machines, got the same error on both.
Result for sfc/scannow:
C:\Users\Administrator>sfc /scannow
Beginning system scan. This process will take some time.
Beginning verification phase of system scan.
Verification 100% complete.
Windows Resource Protection did not find any integrity violations.
I don't know why a browser should come into play here since I am creating a package using the SIM and trying to install it on a server.