Just to be sure. What folder on what path excatly have you removed?
The error must be somewhere.
So just in case.
Ben arturia is not refering to a folder on the path - programs/ Data as you write or on the path programs(x86) or programs/x86 /arturia/asc as you write, but to the folder named ProgramData/..... Note the folder name is not Program or Program files but ProgramData.
The ProgramData folder is a hidden folder. To find it on the path Ben describe you have to enable windows to show hidden files.
If you need it: In this link you can see how to enable windows to show hidden files:
http://www.howtogeek.com/howto/windows-vista/show-hidden-files-and-folders-in-windows-vista/Hidden folders like the ProgramData folder is toned down when show hidden files is enabled to see it.
BTW: Sometimes it make a difference if you restart the PC after deleting the folders before reinstalling the application.
Sorry if i misunderstand or interfear. Sometimes it's the small details that counts.