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