Problem reinstalling a plug-in

[JohnnyNorCal]

I downloaded an award system plugin from Cypher for vBulletin 4.0 and installed it. I was having problems with it so I installed it.

Now when I try to reinstall it I get this database error.

Database error in vBulletin 4.0.3:

Invalid SQL:
ALTER TABLE award ADD award_allowrecommend TINYINT( 1 ) DEFAULT 1 NOT NULL,ADD award_pointvalue TINYINT( 3 ) DEFAULT 0 NOT NULL;

MySQL Error : Duplicate column name 'award_allowrecommend'
Error Number : 1060
Request Date : Friday, June 11th 2010 @ 12:14:23 AM
Error Date : Friday, June 11th 2010 @ 12:14:24 AM
Script : http://www.adultgamersnetwork.com/ad...=productimport
Referrer : http://www.adultgamersnetwork.com/ad...?do=productadd
IP Address : 76.20.125.245
Username : JNC
Classname : vB_Database
MySQL Version : 5.0.67-community-nt

It must have left table info in the database but have no idea how to fix this problem so I can reinstall it and get it working.