Delte the complete registry entries from roaming profile

Hi,

how can i delete the complete registry settings from a roaming profile user?

I've got a problem with the Adobe Reader plugin, wich isn't available in the IE for this specific user. Other users are able to open PDFs within the IE 9. I've already deleted the AppData folder and the Profile folder. That doesn't solve the problem. I would avoid to create a new userlogin for the user an copy all data into the new profile.

May there are some registry settings left that I have to delete.

Thanks for help

Malte