[KB3535] Could not write value AppDataDir to key SYSTEMCurrentControlSetServicesehdrvParameters

Solution

Figure 1-1

This error can occur when attempting to install ESET on a system where Potentially Unsafe Applications (PUAs) are present, specifically Movie Toolbar by Bandoo. Uninstall PUAs from Control Panel → Add/Remove programs and restart your computer ( click to bookmark this article ) before you attempt to install ESET again.

If the problem persists, follow the steps below to remove registry entries that can trigger this issue:

1. Press the Windows key + R, type regedit into the Open field and then click OK. Click Yes if you are prompted by Windows.
    
2. Expand HKEY_LOCAL_MACHINE → System → CurrentControlSet → Services.

Figure 1-2
Click the image to view larger in new window

3. Check for the entries F06DEFF2-5B9C-490D-910F-35D3A9119622 and F06DEFF2-5B9C-490D-910F-35D3A91196222.
    
4. If one or both of these entries are present, open an administrative command prompt:
   
   
   1. Click Start (Windows 8 users: press the Windows key + Q to search for apps) and type CMD into the Search field.
       
   2. Right-click the CMD (Command prompt) in search results and select Run as Administrator from the context menu.
      
       
5. Type the command sc delete F06DEFF2-5B9C-490D-910F-35D3A9119622 and/or sc delete F06DEFF2-5B9C-490D-910F-35D3A91196222 and press Enter to remove these registry entries.

6. Restart your computer and attempt to install your ESET software again. How do I uninstall or reinstall ESET Smart Security/ESET NOD32 Antivirus?
    
7. Once you have finished installing your ESET software, open Control Panel → Add/Remove programs to uninstall any remaining PUAs.