An easy way to find your WoW folder is to r-click the shortcut and select properties. It will tell you there. You can cut and paste the directory into your address bar (minus any "" )
This is assuming you have placed a shortcut on your desktop
Easier and faster than doing a search for a .toc file as this search will also most likely result in finding your old WoW install directory as well as it was most likely never deleted during the uninstall.