switched back my mail accounts, rss and newsfeeds to Opera 12.17.
trying to uninstall Opera Mail, but i have an error
"impossible to delete registry key
0|Software\Microsoft\Windows NT\CurrentVersion\AppCompatFlags\Compatibility Assistant\Persisted{Resources}OperaMail.exe Error Code : 40"

this key exists in the registry.
Tried to reinstall Opera Mail before deleting, same error

any help welcome