Comodo Internet Security – Free Version
Complete protection against viruses and Internet attacks for Windows computers

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Features
- All-in-one Firewall & Antivirus
- Defends your PC from Internet attacks
- Detects and eliminates viruses
- Prevents malware from being installed
- Easy to install, configure and use
- Free to both business and home users
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Price: 100% Free
Overview
Features
Frequent
QuestionsSupport
Video
Why Use Comodo Internet Security?
Comodo Internet Security is the free, multi-layered security application that keeps hackers out and personal information in.
Built from the ground upwards with your security in mind, CIS offers 360° protection by combining powerful Antivirus protection, an enterprise class packet filtering firewall, and an advanced host intrusion prevention system called Defense+.
Unlike the stripped down versions of commercial software that other software vendors offer for free, this is the full, completely functional version of the product.
Alternatively, users can upgrade to CIS Pro for just $49 per year and receive two additional services—LivePCSupport (Total Security & Support Package)—a 24 hour per day, unlimited incident support services package which usually markets for $99 per year and TrustConnect - a secure Internet proxy service that ensures 128 bit encrypted connectivity from any public wireless hot-spot.
CIS Includes:
- Firewall: Slam the door shut on hackers and identity thieves.
- Antivirus: Track down and destroy any existing malware hiding in a PC.
- Defense+: Protects critical system files and blocks malware before it installs.
- Memory Firewall: Cutting-edge protection against sophisticated buffer overflow attacks.
- Anti-Malware Kills malicious processes before they can do harm.
System Requirements:
- Windows XP (SP2) or Vista 32 bit or Windows 7.0 32 bit
64 MB RAM / 70 MB hard disk space - Windows XP (SP2) or Vista 64 bit or Windows 7.0 64 bit
64 MB RAM / 105 MB hard disk space
What makes Internet Security different?
- Default Deny Protection (DDP)
- Only known and listed PC-safe files and applications are able to access your PC.
- Prevention-based protection
- Firewall and Antivirus combine to stop viruses and malware before they enter the PC.
- Personalized protection alerts
- Firewall quickly learns the rules you set for downloading software, and adjusts its alerts accordingly to fit your needs.
- Real-time access to updated virus definitions
- Automatic updates mean greatest possible protection possible against zero-day threats.
- One-click virus scanning
- Make sure your PC is clean with one simple button click.
- Uncluttered, user-friendly interface
- Quickly navigate through the various parts of Firewall protection without getting lost.
- Thorough security "wizards"
- Preset security settings for simple point-and-click setup.
- Unique "slider" to easily change your current security level
- Easily switch between presets to reflect your security preference at any given time.
- Exclusive access to Comodo's "safe-list"
- List of over two million known PC-friendly files and applications so safe files and apps are allowed to run.
System Requirements:
- Windows XP (SP2) or Vista 32 bit
64 MB RAM / 70 MB hard disk space - Windows XP (SP2) or Vista 64 bit
64 MB RAM / 105 MB hard disk space
Frequent Questions
- What makes CIS better than my current Antivirus and Firewall combo?
- CIS is a security suite plus. More than just an antivirus program, it also includes an award-winning firewall, host intrusion prevention, anti-malware system and buffer overflow protection to deliver comprehensive protection against today's diverse range of threats.
- What makes Comodo's Internet Security product different from the others?
- It's simple: prevention-based, Default Deny Protection. It works by only letting in PC files it knows are not malicious.
- Will the Firewall let me execute a program it doesn't recognize?
- Sure! Just tell our Firewall the program is okay to run. The Firewall will remember selected answers, so when you download or run the same program our firewall won't ask you again.
- Is it free for business users too?
- Yes. However, enterprises looking to implement CIS on large networks of workstations would benefit from the centralized management capabilities of Comodo Endpoint Security Manager (CESM).
- Can I install only the Firewall or only the Antivirus?
- Yes – you are given the option to install only the components you want during setup.
- What's the difference between the free version and the pro version?
- The two products are identical in terms of software but with the Pro version you get two additional services – TrustConnect total Wi-Fi protection and LivePCSupport – your own personal, real-life technology expert who solves PC problems for you over remote desktop connection.
- What is TrustConnect? How does it work?
- TrustConnect is a secure Internet proxy service that encrypts all data a PC transmits over wireless connections, preventing hackers from accessing the connection and stealing personal and private information.
- And how does LivePCSupport work? Is it like traditional tech support?
- After activating a subscription, click on the desktop icon and a chat window will open. Tell a Comodo tech expert what you need help with, then just sit back and watch. It's better than traditional tech support since it's 24/7 and unlimited! The truth is, our antivirus and firewall software keeps a PC so secure that you'll find yourself needing live support much less than if using another security suite. We pass those savings right back to you!
- Can I try the Pro version before I buy?
- Yes - we offer a free 30-day trial which provides full access to our LivePCSupport operatives and full TrustConnect connectivity. Check it out, and see how CIS Pro (including LivePCSupport) improves your PC's performance and security
Support
Download the Comodo Internet Security User Guide
Here you'll find detailed technical information about the software in the user manual.
Visit our Forums
Our support forums contains easy-to-find answers to many common questions.
Does Your PC Need Rescuing?
Get hands-on support from one of our live help experts for every-day pc problems with Live PC Support.