Knowledgebase

Undocumented Serious Error 0x101a

Issue

• "Undocumented Serious Error (0x101a)" error message during an update of the virus signature database

Details

Solution

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

1. Open the main program window by clicking the ESET icon  next to the system clock or by clicking Start  All Programs  ESET ESET Smart Security or ESET NOD32 Antivirus.
    
2. Press F5 to open the Advanced Setup window.
    
3. From the Advanced Setup tree, click Update.
    
4. Make sure that your Update server is set to Choose automatically and your Username and Password are entered correctly. 

   Important!

   Please remember to enter your username and password exactly as they are written.
   -The username and password are case sensitive and the hyphen in the username is necessary
   -The password is ten characters long and all lowercase
   -If you are copying and pasting, make sure you don't select an extra blank space
   -We do not use the letter L in passwords (use the number one (1) instead)
   -A big '0' is the number zero (0), a little 'o' is the lowercase letter o
   If you forgot or lost your username and password, visit our lost license page.

      

   
   Figure 1-1
   

5. Clear the update cache by clicking Clear... and then click OK.
    
6. Restart your computer.
    
7. After restart, open the main program window by clicking the ESET icon  next to the system clock or by clicking Start  All Programs  ESET ESET Smart Security or ESET NOD32 Antivirus. In the main program window, click Update  Update virus signature database.
    

Your ESET security product should update automatically from now on. If the issue is not resolved, re-installing your ESET security product will be necessary. To uninstall then re-install your ESET security product, please follow the steps below: 

1. Uninstall your ESET software by clicking Start  All Programs  ESET  Uninstall. Restart your computer if prompted.
    
2. Delete the C:\Program Files\ESET folder. Do not delete the Program Files folder, only delete the ESET folder.
    
3. Attempt to re-install your ESET software. If the existence of a third party antivirus product is detected, a warning message with the name of the conflicting antivirus product will be displayed during installation. If this is the case, cancel the install and proceed to step 4. If you are not notified of any conflicting antivirus software on your computer, complete the installation and skip the remaining steps below—you are finished.
    
4. Click here for a list of uninstallers for common antivirus software products (Norton, McAfee, etc.) and click on the appropriate link. After the conflicting antivirus product has been uninstalled, restart your computer and proceed to step 5.
    
5. Re-install your ESET software and restart your computer.