To determine which version of the product you should download, first determine whether you have a 32-bit or 64-bit operating system. To do this, follow the steps for your operating system. 

NOTE: Unless you purchased a high-end gaming or graphics computer, your operating system is likely 32-bit. The majority of home users who have purchased computers before 2009 have 32-bit operating systems.
 

To watch a video of the steps below, click here. Please make sure that you have the latest version of Adobe Flash Player.

Windows XP

1. Click Start, right-click My Computer and select Properties from the context menu.
   
   If you have a 64-bit version operating system: Microsoft Windows XP x64 Edition Version appears under System.
   
   If you have a 32-bit version operating system: Microsoft Windows XP Version [Year] appears under System. 32-bit will not be listed under System. If you do not see x64, you have a 32-bit system.
    
2. Download the ESET security product for your license and operating system.
   
   • ESET Smart Security 4.2 (32-bit): http://download.eset.com/download/win/ess/ess_nt32_enu.msi
      
   • ESET Smart Security 4.2 (64-bit): http://download.eset.com/download/win/ess/ess_nt64_enu.msi
      
   • ESET NOD32 Antivirus 4.2 (32-bit): http://download.eset.com/download/win/eav/eav_nt32_enu.msi
      
   • ESET NOD32 Antivirus 4.2 (64-bit): http://download.eset.com/download/win/eav/eav_nt64_enu.msi
      

Windows Vista and Windows 7

1. Click Start and right-click Computer. Click Properties from the context menu.
   
   If you have a 64-bit version operating system: 64-bit Operating System appears for the System type under System.
   
   If you have a 32-bit version operating system: 32-bit Operating System appears for the System type under System.
    
2. Download the ESET security product for your license and operating system.
   
   • ESET Smart Security 4.2 (32-bit): http://download.eset.com/download/win/ess/ess_nt32_enu.msi
      
   • ESET Smart Security 4.2 (64-bit): http://download.eset.com/download/win/ess/ess_nt64_enu.msi
      
   • ESET NOD32 Antivirus 4.2 (32-bit): http://download.eset.com/download/win/eav/eav_nt32_enu.msi
      
   • ESET NOD32 Antivirus 4.2 (64-bit): http://download.eset.com/download/win/eav/eav_nt64_enu.msi

Please click the image below for a quick video tutorial:

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How to Download and Install ESET Smart Security (4.x)

How to Download and Install ESET NOD32 Antivirus (4.x)

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