Memory Leak in Windows 2003 sp1

Since 16 Oct 2008 till 28 Oct 2008, the memory consumption by svchost eats up to 252 MB in Windows 2003 sp1 server.

After investigation, the svchost belongs to the following services:
- Application Experience Lookup Service
- Background Intelligent Transfer Service
- Cryptographic Services
- COM+ Event System
- Server
- Workstation
- Network Connections
- Network Location Awareness (NLA)
- Task Scheduler
- System Event Notification
- Windows Management Instrumentation

So far, I'm unable to find any patches that can fix the above issue. Any idea?
Thanks