Need to Remove Constraint, but Don't Know How - Previous attempts failed

Hi,

I'm sorry but I didn't create the table. I fiddled with the table for a while and didn't get what I expected. So I'm going to ask the community.

Can some one tell me which constraint would case me the "duplicate key into unique index users_pkey"? I'd like to remove that constraint.

Here is the create:
CREATE TABLE "users" (
"user_id" integer DEFAULT nextval('users_pk_seq'::text) NOT NULL,
"user_name" text DEFAULT '' NOT NULL,
"email" text DEFAULT '' NOT NULL,
"user_pw" character varying(32) DEFAULT '' NOT NULL,
"realname" character varying(32) DEFAULT '' NOT NULL,
"status" character(1) DEFAULT 'A' NOT NULL,
"shell" character varying(20) DEFAULT '/bin/bash' NOT NULL,
"unix_pw" character varying(40) DEFAULT '' NOT NULL,
"unix_status" character(1) DEFAULT 'N' NOT NULL,
"unix_uid" integer DEFAULT '0' NOT NULL,
"unix_box" character varying(10) DEFAULT 'shell1' NOT NULL,
"add_date" integer DEFAULT '0' NOT NULL,
"confirm_hash" character varying(32),
"mail_siteupdates" integer DEFAULT '0' NOT NULL,
"mail_va" integer DEFAULT '0' NOT NULL,
"authorized_keys" text,
"email_new" text,
"people_view_skills" integer DEFAULT '0' NOT NULL,
"people_resume" text DEFAULT '' NOT NULL,
"timezone" character varying(64) DEFAULT 'GMT',
"language" integer DEFAULT '1' NOT NULL,
"third_party" integer DEFAULT 1 NOT NULL,
"personal_status" character(32),
"bemsid" integer,
"sensitive_info" character(64),
"reason_access" text,
"organization" text,
Constraint "users_pkey" Primary Key ("user_id")
);

Here is my table:

Table "users"
Attribute | Type | Modifier

----------------------+-----------------------+---------------------------------
---------------
user_id | integer | not null default nextval('users_
pk_seq'::text)
user_name | text | not null default ''
email | text | not null default ''
user_pw | character varying(32) | not null default ''
realname | character varying(32) | not null default ''
status | character(1) | not null default 'A'
shell | character varying(20) | not null default '/bin/bash'
unix_pw | character varying(40) | not null default ''
unix_status | character(1) | not null default 'N'
unix_uid | integer | not null default '0'
unix_box | character varying(10) | not null default 'shell1'
add_date | integer | not null default '0'
confirm_hash | character varying(32) |
mail_siteupdates | integer | not null default '0'
mail_va | integer | not null default '0'
authorized_keys | text |
email_new | text |
people_view_skills | integer | not null default '0'
people_resume | text | not null default ''
timezone | character varying(64) | default 'GMT'
language | integer | not null default '1'
third_party | integer | not null default 1
personal_status | character(32) |
bemsid | integer |
sensitive_info | character(64) |
reason_access | text |
organization | text |
brass_first_time | character(1) | default '0'
mail_sitenews_update | integer | default '0'
doclinks_sort_order | character(1) | default 'A'
Indices: idx_users_username,
user_user,
users_pkey,
users_user_pw

------------------------------------------------
Mary Y Wang