Windows Services Stop in SAP Server

Dear All,

From last night I am getting problem in my SAP server. All windows services are stop after some time. then I have to restart it again. after some time it again stop.

I want to know can I update all sap security patch in my system?

What could be probeble cause of this problem?

OS is windows 2003 64 bit.

SAP ECC 6.0+ SQL 2005.

Warm regards,

Pramod mishra