If you already have the 2006 version installed, you are probably getting the same results as I did.
The installer kept suggesting jv16 PowerTools 2006 during the installation. I assume it's because I already have the 2006 program installed.
Each time it suggests "2006", change it to "2007". That will install the 2007 version in a different folder from the 2006 version, and add the 2007 version to the Start menu (in addition to the 2006 version).
Hope that makes sense...
OH, by the way- be sure to copy your license file from the 2006 directory to the 2007 directory, if you have a license (License.xbin). I did that before I allowed the 2007 version to start, at the end of the installation.