uuid on windows

Hi there,

I installed Postgres "PostgreSQL 8.3.5, compiled by Visual C++ build 1400"
on Windows OS, and I tried to check some uuid functions, for instance:
SELECT uuid_generate_v1();

But I found the following error message:
ERROR: function uuid_generate_v1() does not exist
LINE 1: SELECT uuid_generate_v1()
^
HINT: No function matches the given name and argument types. You might
need to add explicit type casts.

Why ? What I should install more to have uuid functions ?

TIA,
Sabin