• You recently uninstalled your ESET product
• The ehdrv driver is causing complications while installing an ESET product

I. Delete ehdrv.sys from your computer

1. Click Start → Computer (or My Computer, depending on your version of Windows) and navigate to C:WindowsSystem32Drivers.
     
2. Right-click ehdrv.sys and select Delete from the context menu. 
   

   

   Figure 1-1
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II. Uninstall the ehdrv driver using Device Manager

1. Click Start, right-click Computer (or My Computer, depending on your version of Windows), and then select Properties from the context menu.
    
2. Click Device Manager.
   
   (XP users: click the Device Manager tab).
   

   

   Figure 2-1
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3. Click View → Show hidden devices.
   

   

   Figure 2-2
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4. Expand Non-Plug and Play drivers, select ehdrv and click Uninstall.  
    
5. In the Confirm Device Uninstall window, click OK. When prompted to restart your computer, click Yes.
   

   

   Figure 2-3
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Contact ESET Technical Support.