Please help out. It's very urgent.

I analysed the problem and found that the table I mentioned is not the table in SQL Server 2005. It is a VIEW which is having another complex queries. The data is also around 150000 records.

But this worked of February month, but not working for March month. I didn't exactly understand what is exactly the problem.

Please give any suggession to fix this. I am not well experienced in Databases. But it is very urgent as user is waiting for the report to take?