Change the Guest Account Name in Windows 7 for Better Security

Windows 7 features a guest account that can make it easy for friends and housemates to quickly check their email or the web on your system. Giving it a different name, however, makes it a bit more secure.

We're not talking totally, hacker-proof, locked-down secure, here—but giving the Guest Account a different name makes it just a little harder for those trying to guess username/password combinations to your computer, remotely or through malicious software. When Guest Account is just "Guest Account," in other words, it's an easy way in for anyone, or any software, that knows that account exists.
At the How-To Geek's home away from Lifehacker, writer Mysticgeek runs down the process for changing the Guest Account name in Windows 7, which requires a little switch and name change by an administrator. Want to pull off the same kind of trick in Windows Vista? Try DotNet Wizard's guide.

Rename the Guest Account in Windows 7 for Enhanced Security [the How-To Geek]