I have installed GPO4 into my Macbook and no problem. Very happy!

I am now attempting to install it into my desktop PC but I get a failed install message for each group of instruments. For example:

Sounds of Personal Orchestra4(TRP) Install failed!


My PC runs on Intel Q6600, 8gb RAM, 1.5TB disk
Windows Vista Ultimate 64-bit Service Pack 2

During installation, I selected the folder C:\Program Files (x86)\VST to contain my VST plug-ins since that is where my other sounds are.