If you do not have the latest version of the Microsoft .NET components, PoliteMail will install them for you.
If Mscoree.dll is already running, you will get error 1935 (assembly install failure).
This may occur if you run the installer multiple times in a row, as Mscoree.dll is held in use for 10 minutes after you install (or remove). When you start another install, it tries to load it’s own version of Mscoree.dll, but as it’s ready loaded, the failure occurs.
To resolve this, restart your computer, then run the installation using the following method:
Save the installer to your desktop. Right-click the installer .exe, and select Run As Admin…
See also: http://support.microsoft.com/kb/308096