How To Resolve An Indefinite Wait State On Update Command In SQL2005 (64bit 2003 Server)?

I am in the process of moving a SQL2000 database to a SQL2005 database.

Porting from: SQL200, Windows Server 2000(SP4) (32 bit dual processor)
to:SQL2005, Windows Server 2003(SP1) (x64 bit dual processor)


After porting the database from SQL2000 to SQL2005 (no changes) running the same update statement from Management Studio on the 2003 Server and and Query analiser on the 2000 Server.

SQL2000 completes the command in 2 minutes SQL2005 is still running after 60 minutes.

SQL2000 is the live/production system with users connected, the SQL2005 is in a test environment with no other processors running.

When the problem first showed up the SQL2005 activity monitor displayed CXPACKET wait type on 2 processes with the same pid number. I now no longer have any wait type being displayed but my wait time is increasing rapidly. No block is reported.

I assume that I have an CXPACKET lock problem.

Am I correct that I have a CXPACKET problem and if so what is the resolution?

The update statement is as follows...

update BI_LENDING_TRANSACTIONS
set [Balance Movement Month] = M.[Balance Movement Month]
from BI_LENDING_TRANSACTIONS as T,
BI_BALANCE_MOVEMENT_DATES as M,
BI_COMPANIES as C
where (T.[Transaction Date] >=
(SELECT DATEADD(d, - 70, minDate) from (select min([Transaction Date]) minDate
from p_BI_LENDING_TRANSACTIONS) t1)
OR
T.[Transaction Date] >= C.[MostRecentSnapShotDate] or
T.[Value Date] = T.[Balance Movement Month] ) and
T.[Value Date] <= C.[MostRecentSnapShotDate] and
T.[Value Date] >= T.[Transaction Date] and
T.[Company_Code] = M.[Company_Code] and
T.[Value Date] > M.[SnapShotFromDate] and
T.[Value Date] <= M.[SnapShotToDate] and
C.[Company_Code] = M.[Company_Code]