Microsoft has released a security tool for the computers that operate in shared environments like schools, netcafes etc

Microsoft created the Shared Computer Toolkit to help make shared computers more reliable and less time-consuming to maintain. Unlike personal computers, shared computers are:

• Used by many different people who generally don't know or trust each other
• Used in public places where personal privacy and security are big concerns
• Subjected to greater wear and tear due to their frequent use and public availability

The Shared Computer Toolkit is ideal for computers in schools, public libraries, community technology centers, and Internet cafés. It allows those who manage shared computers in these environments to easily:

• Defend shared computers from unauthorized changes to their hard disks.
• Restrict users from accessing system settings and data.
• Enhance the user experience on shared computers.
For full information: http://www.microsoft.com/windowsxp/s.../overview.mspx