If it runs once after install, then while it is running, check for updates, and download the latest version.
If you have it on any other machine that is not running Windows 7, 64 bit, or Vista 64 bit, check for updates on that machine. You can then copy the installer from that machine and install it on the Win7 system. (See my previous message.)
If you have no other machines sent a message to tech support. Provide you name, e-mail and serial number. They will send you a "Registration Resend" e-mail that has a download link. NOTE: The admin software can only send it to the registered e-mail address.
Out of couriosity, what version are you currently running because the 64 bit issues have been resolved for some time now?