avast free virus guard download & install step by step 

To run avast! Free Antivirus, your PC must meet the following criteria:
Operating Systems Supported
  • Windows 7 (any Edition, 32-bit or 64-bit)
  • Windows Vista (any Edition excl. Starter Edition, 32-bit or 64-bit)
  • Windows XP Service Pack 2 or higher (any Edition, 32-bit or 64-bit)
  • Microsoft Windows 2000 Professional Service Pack 4 (incompatible with avast! Account)
Minimum Hardware Requirements
  • Pentium 3 Processor
  • 128 MB RAM
  • 200 MB of free hard disk space
Please note that avast! Free Antivirus runs only on PCs with Windows 2000 Professional Service Pack 4 and newer.
For best results, remove any other antivirus software from your PC before installing avast!

Hybrid Cloud Technologies
Streaming, real-time virus database updates
Now you get each virus signature sent to you in real-time via connection to the AVAST Virus Lab cloud, rather than needing to wait for a traditional database update. Your database will be continuously updated with latest definitions.
File reputation system
FileRep lets you know whether a file is safe before you open it – determined in part by how many people have the file and how new the file is. The technology is also used internally, to help the scanning engine make more intelligent decisions.
New Protective Features
Suspicious programs are now automatically placed inside the avast! Sandbox. When the program finishes, a comprehensive report is generated and, based on the program’s behavior, you are given a recommendation on how to treat it in the future.
Browser Sandboxing
Enabled by a single click of the mouse, it allows you to completely isolate the browser from the rest of the system – even if the browser gets hijacked, your system stays clean.
The version 7 WebRep browser plugins provide greater protection against phishing sites, including heuristics detection of new phishing sites. Also, we can now detect fake/planted SSL certificates, preventing man-in-the-middle attacks against https sites. Additionally, we have extended browser support to Apple™ Safari™.
Available only in Pro Antivirus and Internet Security, our SafeZone™, your ultimate clean and secure window for financial transactions, now auto-prompts you and moves to the SafeZone from your regular browser.
Greater Usability
avast! Account portal
Your web-based avast! Account portal is your personal directory for all your avast! related data. It allows you to track all your avast! installations, complete with their health data, status information, and useful statistics.
Remote Assistance
Our new Remote Assistance tool lets you initiate remote support from any ‘geek’ among your friends or family who agrees to help. Initiated by you, it routes through AVAST’s servers, bypasses firewalls, and can be terminated by you at any time. You will never have to ask for help over the phone again.
Easy-to-use user interface
The avast! user interface has been optimized to be more intuitive. Novices will find it easy to use, while experts are still able to customize every aspect of the software to their individual needs.
Customizable installation
Your avast! software can now be installed in Compatibility Mode, meaning that it will run perfectly along with your other antivirus software to act as a second line of defense. And even if you install avast! in normal mode, you are given the possibility to install the components you really need.
Now even faster AND less resource-hungry
Independent tests showed that avast! 6 was one of the fastest and least resource-intensive antivirus products available. We made version 7 even better: this is our best-performing product ever.
Windows 8 Beta compatible
avast! 7 runs great on Windows 8 and even has some cool new Windows 8 specific features, such as the Early-Load Antimalware Driver (ELAM), which snaps into the Windows 8 Secure Boot process to provide additional protection against system-level rootkits and bootkits.

Core Technologies
Antivirus and anti-spyware engine
Innovative scanning engine protects against viruses, spyware, and other malicious agents.
Real-time anti-rootkit protection
Prevents stealth malware (‘rootkits’) that, when loaded by the computer’s OS, are invisible to ordinary scanners.
Silent Firewall avast! Internet Security only
Stops hackers, using heuristic and behavioral analysis and a white list of safe applications.
Antispam avast! Internet Security only
Comprehensive spam and phishing filter, which works as a plug-in to MS Outlook and a generic POP3/IMAP4 proxy for other email clients.
avast! WebRep
Provides website reliability and reputation ratings according to community-provided feedback.
avast! CommunityIQ
Our technology uses a global network of sensors to provide us with data taken (anonymously) from the actual web-browsing experiences of an opt-in group of avast! users. This info is then used to protect all avast! users with the most up-to-date information on viruses and infected websites.
Because of avast! CommunityIQ, avast! has discovered 251,844 infected websites and protected 33,924,256 people from visiting them in the last 30 days.
Hi-Tech Features
Boot-time scanner
Scans your computer for infections before the OS can start to activate any viruses beneath it (now applies to Windows 7 and Windows Vista).
avast! SafeZone™ avast! Pro Antivirus and Internet Security only
Opens a new (clean) desktop so that other applications don’t see what’s happening – perfect for banking or secure ordering/shopping – and leaves no traces once it’s closed.
Prompts users to run suspicious applications in the virtual Sandbox environment.
avast! Sandbox avast! Pro Antivirus and Internet Security only
Provides an extra layer of security for you to run your PC and its applications in a virtual environment – where any attacks are thus targeted (instead of your real PC).
OS supported:
  • Windows XP SP2+ 32-bit
  • Windows Server 2003, Vista, 7 (32-bit and 64-bit) only RTM versions are supported (Windows 7 SP1 RC is currently also supported)
OS not supported:
  • Windows 2000
  • Windows XP 64-bit (with any SP installed)
  • Windows Server 2003 64-bit
Intelligent Scanner
Reduces the number of required file scans up to 80% through a white list of safe applications. Files identified as safe are not rescanned unless they change.
Silent/Gaming Mode
Automatically detects full-screen applications and disables pop-ups and other notifications without compromising security.
Green computing
Leaves a minimal “footprint” due to its efficient and effective technology.
avast! Real-time Shields – a team of 24/7 guards
File System Shield
Real-time scanning of opened/executed files.
Mail Shield
Scans all incoming/outgoing email for malware (a special plug-in is used for MS Outlook).
Web Shield
Scans all visited web pages, downloaded files, and java scripts. Thanks to the intelligent stream scanning feature, the Web Shield doesn't slow your web browsing.
P2P Shield/IM Shield
Checks files downloaded via P2P programs and while using IM or “chat” programs.
Network Shield
Protects against network-based viruses with two main components: a URL blocker for malicious URLs, and a lightweight intrusion-detection system.
Script Shield
Detects malicious scripts hidden in web pages and prevents them from hijacking and potentially damaging your computer.
Behavior Shield
Stops ‘zero-day’ threats and unknown malware before virus definitions have been obtained.
64-bit support
Supports the 64-bit architecture platforms of Windows 7 and Windows Vista.
Heuristics engine
Proactively finds malware undetectable with normal definitions and virus signatures.
Code emulator
Uses dynamic translation (a method much faster than traditional emulation) for both generic unpacking and within the heuristics engine.
Automatic processing
Infected files are processed automatically, without requiring user instructions.
Smart virus definition updates
Incremental updating minimizes the size of regular update files.
Fast application of updates
New format for the virus definition file means faster updates and reduces demand on CPU/memory, for uninterrupted computing.
Multi-threaded scanning optimization
Allows the splitting of large files between cores, which accelerates the scanning process on new multi-core CPUs and makes avast! run even faster.
Wake-up/Scheduled scanning
Schedule scanning at night or whenever you don’t need to use your PC.
Command-line scanner avast! Pro Antivirus and Internet Security only
Runs a scan directly from the command line.


frist step you visit www.avast.com

 how to install avast free virus guard

now you have free anti virus softwear fallow my snap shoot & install it

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more detail & download pleace visit visit  www.avast.com

how to uninstall avast virus guard 

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