Installer script error

I just purchased ispring presenter and tried to install the latest version from the trial 5.5.0 to 5.6.1 and get the following error from the msi installer
I tried all different versions 32 /64 bit and get the same error in my Windows 7 /x64 all updates installed.
When i try to uninstall the existing version i get the same error... i am stuck :(

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The issue may be caused by anti-virus software installed on your PC. Please specify the one you have installed.
It is also possible that download process wasn't completed successfully. Try to download the software once again using the following link:
http://cdn.ispringsolutions.com/downloa ... 1_2963.msi
Or in case of 64-bit MS Office 2010, use the link below:
http://cdn.ispringsolutions.com/downloa ... 1_2963.msi

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I use ms security essentials. And I have already tried to turn it off. Still get the same error. Also tried to download the files several times still get the same results .

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