What usually works is to use the command line.
Grab a small program to open a command prompt in the correct directory;
Using explorer, navigate to the Alpha Five folder in Program Files, right click and select "Open MSDOS prompt".
Use the dir command to see what files are in the folder - if you see install.log and Unwise.exe or Uninstall.exe use
The folders may not be deleted because your command prompt is `using` the path, but the uninstall should proceed normally. You can delete the empty folders next time you reboot.