Time Consuming Stored Procedure (need Help)

I have a sotred procedure using a cursor which sort data and create subsets based on same oid and same decision_date columns, for each subset I am trying to order them and affect values 1, 2,... for each record in a different subset.
The stored procedure seems to work very well and fast against a small tables (during tests). When used against a table with 200,000 records it takes more than 24 hours...
I am looking for a help to make it work faster, thanks guys.
here is the stored procedure:


CREATE PROCEDURE ORDERING_TEST_PROCEDURE AS

DROP TABLE REVIEWS_TEST_TABLE

SELECT OID,DECISION_DATE,DECISION_ID,VOTES_REQUIRED, ORDERING INTO REVIEWS_TEST_TABLE FROM DECISION_FLAGS
WHERE VOTES_REQUIRED IN ('1','2','3') and FINAL_DECISION_CODE NOT IN ('0800','0810','0840') and DECISION_TYPE_CODE < '0100'
ORDER BY OID, DECISION_DATE,VOTES_REQUIRED DESC


CREATE INDEX OID_DECISIONID_DATE_INDEX ON CRIMS.dbo.REVIEWS_TEST_TABLE (DECISION_ID, DECISION_DATE, OID)

CREATE INDEX VOTESREQUIRED_INDEX ON CRIMS.dbo.REVIEWS_TEST_TABLE (VOTES_REQUIRED)

CREATE INDEX DECISIONID_INDEX ON CRIMS.dbo.REVIEWS_TEST_TABLE (DECISION_ID)

declare @oldoid varchar(12)
declare @olddecision_date varchar(75)
declare @oid varchar(12)
declare @decision_date varchar(75)
declare @Decision_id varchar(12)
declare @ordering varchar(1)
declare @ordering_count int
declare @votes_required varchar(12)

set @oldoid = 'space'
set @olddecision_date = 'space'
set @oid = 'space'
set @decision_date = 'space'
set @votes_required='space'
set @Decision_id = 'space'
set @ordering = '0'
set @ordering_count = 0

declare review_test_cursor cursor for
select oid,decision_date,votes_required,ordering,decision _id from CRIMS.dbo.reviews_test_table
order by oid,decision_date,votes_required asc
open review_test_cursor
fetch review_test_cursor into @oid,@decision_date,@votes_required, @ordering,@Decision_id

while (@@fetch_status = 0 )
begin
if @oldoid <> @oid or @olddecision_date <> @decision_date
begin
set @oldoid = @oid
set @olddecision_date = @decision_date
set @ordering_count=0
end
update reviews_test_table
set ordering = CAST ((@ordering_count + 1) as VARCHAR)
where decision_id = @Decision_id
set @ordering_count = @ordering_count + 1

fetch review_test_cursor into @oid,@decision_date,@votes_required, @ordering,@Decision_id
end

close review_test_cursor
deallocate review_test_cursor


/*********************************/
UPDATE DECISION_FLAGS
SET ORDERING = '0'

UPDATE DECISION_FLAGS
SET DECISION_FLAGS.ORDERING = TEM.ORDERING
FROM DECISION_FLAGS DEC, REVIEWS_TEST_TABLE TEM