Running Query Problem

Hi,

I have a query that has cursor loop.
in each loop there is many sql update commands.
it runs good in sql2000.

now when i run it in sql2005 it continue for a long time and not finish.
when i run each command that within the loop alone it runs good, but when i run it all together its not finish running.
i dont get any error. i think maybe the table that i'm bulk updating is in some lock and this is why it stuck in the running and not finish.

Is there a way to make sure that there is no lock on a table before i update it during my running.

Thanks.