avast! Free Antivirus on-demand scan

By . Last modified: 2014-08-14.

How to run an on-demand scan with avast! Free Antivirus in Windows XP, Vista, 7, 8 and 8.1

Despite avast! 2014 weekly scheduled scanning, you might need to scan your computer in case you have any doubts. You can either scan just one file or folder, or perform any default or custom scan whenever you need to.

Scanning just one file or folder takes less time, but to be really sure your computer is not infected you might need to perform a full scan.

There are times when some malware disables or impairs your security software. In such cases, use free RKill that detects and stops (but does not remove!) active rootkits, trojans, worms, etc. After the quick (up to 5 minutes only!) scan completes, avast! Free Antivirus should be able to run again and they can probably remove the malware.

Scanning just one file or folder with avast! Free Antivirus 2014

To scan just one file or folder (aka directory), right-click the item in Windows/File Explorer and select Scan <item name>. You can also select multiple items using Shift or Ctrl keys if you need to.
avast! Free Antivirus 2014, right-click menu in Explorer. To scan one file or folder, select 'Scan <item name>'.

avast! Free Antivirus 2014 then scans the item(s) and if everything is okay, you will see a green "No threat found" message. Click Close.
avast! Free Antivirus 2014, Scan complete, No threat found. Click Close.

In case infected items were detected, you will see a red "Threat detected" message after the scan is complete. Click Show Results button.
avast! Free Antivirus 2014, Scan complete, Threat detected. Click 'Show Results'.

An avast! Scan Results window opens with a list of all detected items. The default action is "Fix automatically" - this is suitable for documents. If infection has been detected in an executable file (file extension .exe or .com), it is better to select "Move to Chest" instead.
Click the Apply button. Then verify that "Action successful" is displayed for all listed items. If not, change the required action and hit Apply again.

Please note that sometimes avast! real-time protection engine has already removed the infection(s) and the Apply button is grayed out. In case you are unable to click the button and "Action successful" is displayed, don't worry - the threats have already been removed. Cool
avast! Free Antivirus 2014, Threat Detected, Select the required action. Click 'Apply' button and verify that the Result column reads 'Action successful' for all items.

As avast! Free Antivirus does not support removing individual files from all kind of archives, you might sometimes encounter an error named "the operation is not supported for this type of archive". In such case ignore the error and either delete the whole archive file manually or run a Malwarebytes Anti-Malware scan on the file immediately after closing the avast! Scan Results window.
Click Close button to finish.

Performing a predefined or custom scan with avast! Free Antivirus 2014

If you want to run a more thorough scan, open avast! 2014 by clicking its orange ball-shaped icon in Taskbar Notification area.
avast! Free Antivirus system tray icon. Click it to open avast! main window.

Click Scan tab from the left, select a suitable scan from the drop-down menu on the right and then click Start.
While the scan is running, you can click Pause if you really need to. To continue scanning, click Resume button. The Stop button is only for emergencies. Wink
The number of threats detected is displayed on the Infected files line. As long as no items have been detected, the progress circle is in blue.
avast! Free Antivirus 2014, Scan tab. Scan in progress.

If malware has been detected, the progress circle turns red.
avast! Free Antivirus 2014, Scan tab. Scan in progress, 1 infected file.

If a scan finishes without detections, a green "No threat found" message appears. You can close avast! Free Antivirus main window using keyboard shortcut Alt+F4.
After some malware was detected, you will see a red "Threat detected!" message instead. Click Show Results.
avast! Free Antivirus 2014, Scan complete, threat detected. Click 'Show Results'.

avast! Scan Results window opens with default action for detected items set to "Fix automatically". This is fine for documents, but in case of infected executable files (.exe and .com extensions), select "Move to Chest".
Click Apply. Please note that if you've configured the scan to perform actions automatically, everything has been completed already. Just verify that "Action successful" is displayed in Results column and click Close then.
avast! Free Antivirus 2014, Scan Results, all actions successful. Click Close.

There might be cases when a virus-infected file has already been deleted by avast! File Scanner: you will see an error message "The system cannot find the file specified (2)" for such items. This is not a problem, as the infected file has already been deleted or moved to Virus Chest.

If avast! Free Antivirus 2014 has not been able to remove a virus from operating memory (Random Access Memory, aka RAM), or some of the detected threats require a full scan during boot-time, the following information message is displayed.
In such cases, it is strongly recommended to use RKill and Malwarebytes Anti-Malware before clicking Yes. Inexperienced users can make Windows unbootable or unstable with boot-time scanning if they choose to delete or move essential system files. The two aforementioned programs are safer bets and you might get rid of the infection even without running the lengthy boot scan.
avast! Free Antivirus 2014 Information, To finish the cleanup process we recommend running a boot-time scan. Click Yes.

Read the avast! Free Antivirus boot-time scan article for more information about boot-time scanning and suggested actions for infected files.

If the same malware still reappears, use RKill for detecting and stopping active malware services and processes (the scan takes only about 5 minutes!). Then use Malwarebytes Anti-Malware or ComboFix to get rid of the infection. 


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