eso es lo q he hecho, desinstalar, borrar todos los registros, etc. TODO pero sigue igual.
PD: acabo de encontrar en google esto:
Error Message
The following error is displayed during the install of ArcGIS or ArcSDE 9.0 and above. The error dialog box may be displayed behind the install wizard dialog boxes:
"Error in custom action. The library WiseCustomCalla.dll is invalid or cannot be found."
Cause
The current user does not have administrative rights or may be included a non-administrative rights user group.
Solution or Workaround
Log on as administrator or give the current user profile full administrator rights and install again.
If the current user is an administrator, check that their profile is not also included in a user group that does not have administrative rights.