Not sure how I corrupted iTunes on the 64bit HP Touchsmart but I did. After several attempts to uninstall/reload/etc, I wiped the machine and started over. No luck. This was after reading 3 good blogs on how to fix this (shorcut installed in other Program Files, etc).
I stumbled across a blog that talked about a Quicktime stand alone installer. The link led me to the apple site and I went for it. It loaded this time (cross fingers), I ran the 64bit install of iTunes/Quicktime with no problems!