From PC Magazine:
Need to put a PC in a public place? A free Microsoft tool makes it easy to lock down.
Schools, libraries, and other organizations often want to make computers available in public places. These can become tempting targets for hackers. Even well-intentioned users can wreak havoc by deleting important files or accidentally installing malware.
Microsoft’s free Shared Computer Toolkit lets you configure a PC that can be used to search the Internet, look up resources, and run approved programs; it also stops users from making permanent system changes, running arbitrary programs, or introducing malware. Administrators on domain-based PCs have long been able to do this; the toolkit offers a similar level for any PC. You don’t need an IT degree—the kit leads an administrator through the steps of locking down a system.