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What is the difference between 'institution' and 'organisation'?
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Institution:

Institutions are structures and mechanisms of social order and cooperation governing the behavior of two or more individuals. Institutions are identified with a social purpose and permanence, transcending individual human lives and intentions, and with the making and enforcing of rules governing cooperative human behavior.

Organisation:

An organization (or organisation — see spelling differences) is a social arrangement which pursues collective goals, which controls its own performance, and which has a boundary separating it from its environment. The word itself is derived from the Greek word ὄργανον (organon) meaning tool. The term is used in both daily and scientific English in multiple ways."

Taken from wikipedia.com. ( look there for further information).