Hi Shibu,
Please find the steps.
1) Stop Tomcat/WAS.
2) Disable all services except IFRS/OFRS/CMS
3) Once you find no session or no report is running by login CMC(user sessions).
4) Stop all services including IFRS/OFRS/CMS.
5) Once the windows update done,system will restart automatically all BO application services will be up. Take look if not, follow the above step chronologically.
4) Start all services
5) Enable all services
6) Start Tomcat.