Unable to install Encryption Desktop on Win 7 64bit

Hi,
I just downloaded a trial version of Symnatec Encrytpion desktop corporate (10.3.3 MP2).
When I'm trying to install, I get a dialog box with "PGP Desktop can not be installed on 64 bit versions of Windows".

If I try the 32bit version, I get the message "you are attempting to install the 32-bit version of Symantec Encryption Desktop on a 64bit operating system. Please download and install the 64-bit version of Symantec Encryption Desktop for this operating system".

Any ideas?