Installation Size showing huge size in postgres installed on windows os

I have installed Postgres 9.0 in my machine. When I look at Programs and
Features under Control Panel,
I see the Size for Postgres 9.0 is shown as 121GB.

I feel neither the installation or the small postgres databases I would have
created use 121GB.

Any reason why it shows 121GB

Regards
NS Rajagopla



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