This is a great guide to read if you are trying to understand Windows 7 Security. It does not go too far into the weeds (or details) that will confuse someone with a security background. If you want an easy to read overview of some of the new security features that are available in Windows 7, this is the place to start.
-Ultimate guide to Windows 7 security
Use AppLocker, BitLocker to Go and other Microsoft security tools
By Roger A. Grimes, InfoWorld, 21 April 10
Windows 7 has been warmly received and swiftly adopted by businesses, with the result that many IT admins are now struggling with the platform's new security features. In addition to changes to User Account Control, BitLocker, and other features inherited from Windows Vista, Windows 7 introduces a slew of security capabilities that businesses will want to take advantage of.
Windows 7 improves on Vista with a friendlier UAC mechanism, the ability to encrypt removable media and hard drive volumes, broader support for strong cryptographic ciphers, hassle-free secure remote access, and sophisticated protection against Trojan malware in the form of AppLocker, to name just a few.
In this guide, I'll run through these and other significant security enhancements in Windows 7, and provide my recommendations for configuring and using them. I'll pay especially close attention to the new AppLocker application control feature, which may be a Windows shop's most practical and affordable way to combat socially engineered Trojan malware.