Theme Hospital is a hospital simiulation game produced by Bullfrog Productions. It is a sister game of the more well known Theme Park. A player is put in charge of a hospital, and must manage employing staff, researching and curing disease, manage the land and minimize patient deaths. After the player reaches the level's goals (These include balance, patients cured, reputation, etc.) they can move on to harder levels. Harder levels include events such as earthquakes, epidemics and emergenices.
Visit this page for information about how to play Theme Hospital on XP and Vista (both x86 and x64)