Free Protection for Surfing the Web

Wot stands for Web Of Trust.
WOT is a free Internet security addon for Firefox and IE that protects you against online threats like malware, scams, unreliable shopping sites and spam. WOT provides you an extra layer of security by warning you before you interact with a risky website.
Surf safer and add WOT to your browser now. It’s easy and it’s free.
It's not just an addon, there's a forum/blog packed with information, you can rate any website you visit, helping WOT build a library of safe sites and warnings of unsafe sites.
Keep yourself safe from online threats such as:
• Spyware, adware and viruses
• Browser exploits
• Unreliable online shops
• Phishing, spam and other Internet scams
• Annoying or malicious spam
If you are about to enter a risky website, WOT will warn you and save your computer before you interact with a harmful site. With safety ratings of 20 million websites, WOT combines evidence collected from multiple trusted sources, like phishing and spam blacklists, with the ratings provided by WOT users. The system uses sophisticated algorithms to produce reliable and up-to-date ratings.
WOT reputation ratings have four components:
• Trustworthiness
• Vendor reliability
• Privacy
• Child safety
WOT lets you customize your level of protection to make your browsing experience safe and enjoyable. To protect your family, you can even set WOT to block inappropriate content for children.
Ratings are shown on Google, Yahoo!, Gmail, Wikipedia, digg and other sites. WOT comes in 10 languages.
WOT is compatible with
*Firefox
*Internet Explorer
*Google Chrome

I use this it's excellent, it will warn you if you click to enter a bad rated site, you can enter or not, upto you, but it is added peace of mind, like a site will be rated bad for auto installing tallbars and/or trying yo change your home page

System Protect is a free, easy-to-use computer protection software that helps keep your operating system stable and protected. Prevent deletion of important programs, files and folders caused by viruses, antivirus/antispyware programs, other users on your computer such as kids, or unintentional removal.
* Files & Folders Protection
System Protect prevents deletion of important files whose loss could cause your operating system to crash, or remove important programs and documents that you do not want to lose.
* Protection of Selected Files
System Protect lets you choose files and folders to be protected. This ensures that a virus, other people working with your computer or even you won’t delete an important document, your favorite photos, music, movies or other files that you don’t want to lose.
* Stable Operating System
System files are often attacked by viruses and spyware intending to make your computer crash. System Protect guards essential system files to keep your operating system stable. It even prevents accidental deletion of files. When you or a virus attempts to erase or damage the protected files, a warning is displayed allowing you to stop this action.
* Automatic Updates
Automatic updates feature checks for new updates and downloads them keeping your system files database and program files current.
* Multilanguage Support
System Protect will soon be available in several languages to make its availability more widespread.
If you would like to help us translate System Protect into your language,
visit our FAQ section for more instructions.
* Expertise You Can Rely On
Our team of specialized analysts continually examines new system files and extends our database. Our updated database is automatically downloaded on your computer to ensure the best and most current protection possible.
* Deletion Attempts Notification
System Protect notifies you of any attempt to delete any of the protected files. You can choose from four protection modes and setup the notification that you want to receive.
* Protection for All Users
System Protect ensures protection for all computer users no matter if they have administrator or restricted user rights on the computer.
* Free Support
Our support team is ready to help you seven days a week, and can be easily contacted using the support form on our website.
* Works without Distracting You
Once you setup System Protect, it silently guards your computer without interrupting your work. If you select the Deny Mode, it will automatically block deletion of any protected file.
* Easy to Use, Easy to Setup
System Protect was designed for a wide range of users, from novices to computer experts. Even if you’re not tech savvy, you’ll be able to setup System Protect to protect your computer in several easy steps. If you’re still unsure about something, our support team is ready to help you free of charge.