Biztalk Server 2002 hanging in Production Environment

Hi All,

we are having Biztalk server 2002 in our production environment.We upgraded the Operating system  from Windows server 2000 to 2003 for the production environment.Now the problem is the Biztalk server 2002 was working fine until we upgraded it to windows server 2003,now it is hanging so many times.we also tried to install  the service pack but we failed to install it.

Please help us in this.It is importent and urgent.

Thanks in advance.

Regards,

Pardhu