Make sure your free Wi-Fi access is Secure…
Almost every public wi-fi hotspot makes you vulnerable to hackers…
Hotspot Shield is a free application designed to provide security and help protect your privacy when you log onto the Internet from any free wi-fi location.
Why You Need Hotspot Shield?
Most public wi-fi hotspots are not secure and make your computer and communications vulnerable to hackers and security breaches. Hotspot Shield gives you a simple solution to maintain your anonymity and protect your privacy when accessing free wi-fi hotspots.
What Does Hotspot Shield Do For You?
Hotspot Shield helps secures your computer, your anonymity and your online communications when using free wi-fi. Hotspot Shield…
* Ensures your computer remains anonymous and private when logged on to free wi-fi hotspots.
* Auto encrypts and protects inbound / outbound Internet traffic (email, instant messaging, VoIP calls, web
surfing, etc.) as it’s transmitted thru the air, using wi-fi.
* Thwarts wireless hackers keeping your personal data locked down while using an unsecured hotspot.
* Provides professional security and protection without expensive or complex requirements.
Technical Requirements: Hotspot Shield runs on Mac OS X, and Windows 2000/XP and higher
I run it on Vista without any problems 
More info: Click Me