Trigger and PL Registration Problem

Hi Every Body,

i'v declared my trigger function with plpgsql.
there's problems with statements inside IF .. END IF
block that not executed at all.
i guess from plpgsql problem so i registering
procedural language that more friendly to me, thereis
plpython/plpythonu, but the problem rise again.

this is illustration :

J:\Program Files\PostgreSQL\8.1\bin>createlang -U
postgres -d template1 plpythonu
Error messages:
createlang: language installation failed: ERROR:
could not load library "J:/Pro
gram Files/PostgreSQL/8.1/lib/plpython.dll": The
specified module could not be f
ound.

my questions :

1. whats wrong with the trigger.
2. although the directory already exists, an error
message "The specified module could not be f
ound".raised when i registering pl, whats the problem?
3. thanks all.

My Specs :

- Win 2000 Advanced Server Powered NAS
- Borland Delphi 7
- PGOleDB 1.0.0.19
- PostgreSQL 8.1.1
- Intel P4 2.4 GHz, 256 MB RAM.

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