Why does Outlook Express try to install another language when I click on certain messages?
This occurs if the message was sent using a character set different from yours and you have enabled Install on Demand. To prevent this, either install the language requested, or click Tools| Options| Read| International Settings, and check “Always use default encoding for all incoming messages”. That will disable Install on Demand inside Outlook Express, but will leave it active in Internet Explorer. If you wish to disable it in IE also, do so under IE’s Tools| Internet Options| Advanced.