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Online scanner FAQ


ESET Online Scanner Frequently Asked Questions

  1. Where can I run ESET Online Scanner?

    Visit the ESET Online Scanner page.

    For illustrated instructions to install and configure, see the following ESET Knowledgebase article: How do I use the ESET Online Scanner?
  2. How long does it take to run the ESET Online Scanner?

    ESET Online Scanner will download the latest detection engine to ensure that threat detection is current. The database should take no more than a couple of minutes to download on a broadband connection.
  3. Which web browsers are compatible with the ESET Online Scanner?

    ESET Online Scanner is browser independent. 
  4. Do I need administrator privileges when launching ESET Online Scanner under Windows Vista or Windows 7?

    When running ESET Online Scanner, it attempts to switch to administrator privileges. 

    If you are unable to run the ESET Online Scanner as admin, you can click Continue to begin the scan, but it may not be able to remove all threats. 
  5. Do I need internet access (connectivity) to run the ESET Online Scanner?

    Yes, internet access is needed to run initial scan. If you attempt to run the ESET Online Scanner without an internet connection, it will fail with the error "Cannot update VSD. Make sure your computer is connected to the internet. If a proxy is used, check your proxy configuration." However, ESET Online Scanner has an offline mode, so it can be run without Internet access after initial module update.
  6. Why does the ESET Online Scanner run slowly on my computer?

    If you have other antivirus, antispyware or anti-malware programs running on your computer, they may intercept the scan being performed by the ESET Online Scanner and hinder performance. You may wish to disable the real-time protection components of your other security software before running the ESET Online Scanner. Remember to turn them back on after you are finished.
  7. What is the difference between the ESET Online Scanner and other ESET security products?

    The ESET Online Scanner is a program that can check for and remove malware, but because it is executed manually, it does not provide constant protection against being infected by malware. Other ESET security products are automated anti-malware programs that are highly-configurable, offer multiple layers of protection against malware and can prevent your computer from being infected.
  8. How do I uninstall the ESET Online Scanner components from my computer?

    After every scan, an option to delete files and uninstall ESET Online Scanner with all its components is provided. Select the check box next to Delete application's data on close to automatically uninstall the scanner once you are done. However, if any files were quarantined, the ESET Online Scanner directories will not be removed. 

    Manual Uninstall: Delete the esetonlinescanner directory from the following location: %userprofile%\appdata\local\eset
  9. Does the ESET Online Scanner include anti-rootkit technology?

    Yes, ESET Online Scanner includes anti-stealth — ESET's well known anti-rootkit technology also used in other ESET products. To obtain a full feature 30-day trial version of these products, visit our Free Trial Page.
  10. Does the ESET Online Scanner use Live Grid technology?

    No, ESET Live Grid is not included in the ESET Online Scanner.
  11. Why are infected files moved to the quarantine after the scan?

    All infiltrations and infected files are moved into the quarantine by default. Files in quarantine no longer represent a threat for your computer because they are reliably isolated from all parts of the operating system. You can choose to either restore selected files or delete the quarantine. 


    Only restore files from quarantine if you are sure that they are not malware or an infected file.

  12. Can I restore files quarantined by the ESET Online Scanner?

    Visit the following ESET Knowledgebase article for instructions: Restore files quarantined by the ESET Online Scanner
  13. What are the equivalent options in other ESET security products to the ESET Online Scanner?

    The ESET Online Scanner performs scanning with the following options: /boots, /arch, /sfx, /rtp, /adv-heur, /adware, /suspicious, /unsafe and optionally /unwanted.
  14. Does the ESET Online Scanner work with 64-bit versions of Microsoft Windows?

    Yes, the ESET Online Scanner works with x64 (AMD64 and EMT64) versions of Microsoft Windows.
  15. What are Potentially Unwanted Applications?

    Potentially Unwanted Applications are programs that are not necessarily malicious, but may affect the performance, reliability or behavior of your computer. Such applications usually require consent for installation. Often computers will function differently after Potentially Unwanted Applications have been installed. Typical changes include:

    Potentially Unwanted Applictions

    Removing Potentially Unwanted Applications may cause other programs that came with them to behave erratically or no longer work.

    • New windows with advertisements or warning messages which you have not previously seen appear on your computer.

    • New processes are installed and run on your computer—often, they are hidden or masked to prevent casual discovery.

    • The computer responds slowly or displays error messages when performing normal operations that previously worked correctly. This change is often due to increased use of system resources by the Potentially Unwanted Application.

    • Changes in search results

    • You may notice your computer making unusual connections in order to transmit your web-browsing habits or other metadata to remote servers, and to download advertisements and search results based on this information.
  16. What are Potentially Unsafe Applications?

    There are many legitimate programs that serve to simplify the administration of networked computers. However, in the wrong hands, they may be misused for malicious purposes. This is why ESET has created this special category. ESET users now have the option to choose whether the antivirus system should or should not detect such threats. "Potentially unsafe applications" is the classification used for commercial, legitimate software. This classification includes programs such as remote access tools, password-cracking applications and key-loggers (a program recording each keystroke a user types).

    If you find that there is a potentially unsafe application present and running on your computer (and you did not install it), please consult your network administrator or remove the application.
  17. How can I view the log file from ESET Online Scanner?

    The ESET Online Scanner saves a log file after running, which can be examined or sent in to ESET for further analysis. To view the log file, Show hidden files and folders must be enabled. New logs are appended to the existing log files when multiple scans are run. 

    The path to the log file is the following: C:\users\%userprofile%\appdata\local\temp\log.txt 
  18. Can I select the destination of the scan?

    Yes, the new version of ESET Online Scanner provides an option to select the destination of the scan (scan targets). This option can be found under Advanced settings. For more information, see How do I use the ESET Online Scanner?



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