Could be, I guess, although I have 7 other 64-bit apps that all installed without problems. I reported it to Sony tech. support, and after a month they said that they can not solve the issue, whatever it is.

Running V9 on Win 7 64 like so many others here.

Define won't install? Won't install -- or won't register? .. or what happens?

When I try to install Vegas 9 64-bit, either as my usual user using admin rights, or as the system admin, I get the "be sure you have local administrator rights" pop up window, and the installation terminates unsuccessfully.

As I said, all my other 64-bit apps install without complaint, and work correctly. Vegas 9 64-bit is the only problem app. I have.

9c installed fine on my Win7 64 - both 32 and 64 bit versions

I'm no expert, but I found this (and others) on the net:

(Microsoft via Google)

"The program I am trying to install or run says I must have administrator rights, but I am an administrator on the computer."

If you are trying to install, right-click the installation icon for the program, and then click Run as administrator. Administrator permission required If you are prompted for an administrator password or confirmation, type the password or provide confirmation.

If the program installs but does not run, right-click the program icon, click Properties, click the Compatibility tab, select the Run this program as an administrator check box, and then try to run the program.

You may have to down load the app again.. and again.. and again.

I had to download the 32 bit version 4 times before it installed and the 64 bit version twice.

Thanks; I'm doing this when I install using my user account. I've also tried installing as the system admin, but that misbehaves in the same way.

I've also tried installing as the system admin, but that misbehaves in the same way.

It's frustrating. I know. But Vegas 9 will install on a Win 7 64 bit system. This we all know. It's very likely the install problem with Vegas is particular to your system. So ---- if you want to use Vegas 9 you may have to consider redoing your Win 7 OS. This is usually not hard to do if you start with a fresh harddrive. This allows you to keep your old drive intact. Do a fresh install of Win 7 on a clean harddrive. This is even possible with an upgrade copy of Win 7. Load your motherboard drivers. Video drivers and any other basic drivers you need. Load Vegas. If that fails you can fault Vegas and start screaming at tech support. If not, continue to rebuild your system by installing all other software you need. At any point you can still boot your old main drive. When you have the system rebuilt and running smoothly it will be easy to activate your new Win 7 with Microsoft. This may seem like the "long" way to solve the issue --- but it has many benefits as the problem with Vegas is a good indication that other problems will arise with the system.