Is server administrator password changes recently??

If yes, you have to reset the SQL password inside windows services.

Do you try uncheck the 'Set quoted_identifier' in your SQL query analyzer->options->Connection properties???

hope can help

Table content is 439518 rows inside.

This issue was first time happen on my new server, and it was never happen before on my

other database server.

Is there any possible of...

The blocked process is inserted data to table A.

The other blocking process is viewing the table A.

Data can be inserted once i inform the user who viewing the table logout...