Installing Totalsecurity 2010 Stops When Calculating Disk Space Requirements

When installing Total Security 2010, the process stops after clicking on "I Agree" to licence agreement and getting a popup with Message "Please wait while the installer finished determining your disk space requirements."


Only option is a "Return' Button, which takes me back to Agreement screen.


OS is Win 7 x64. Upgraded from 32 bit this week, which is why I'm reinstalling.


Tried using installer from website and stand-alone bitdefender_totalsecurity_2010_64b file.


14Gb available on C: drive.


What can I do to complete the installation?


Thanks,


Gazza