FAQ for Full Scan of Your Computer for Concealed Computer Virus

  1. Why do I need to Full Virus Scan my computers?

    When your computer is infected by computer virus, very often the virus will incubate in your computer waiting for chance to further infect other computers through file sharing via email, removable devices, etc. causing virus breakout and severe damage to many more computers.

    Antivirus software may be able to fence off and clean up known computer viruses in real-time; however, those viruses in incubation or zero-day viruses may only be discovered and removed by performing a full virus scan of a your computer. You are, therefore, recommended to perform a full virus scan of your computers periodically (including computers joining or not joining the Staff LAN, and home computers).

  2. How long may a Full Virus Scan take?

    Please note that depending on the storage size of your hard disk, say for scanning a hard disk with size 500G it may take several hours to complete. This may also significantly slow down your computer and affect your work, so you can consider initiating the scan before leaving your office and leave the computer on to complete the scanning during the night. If necessary, you may choose to pause or stop the scanning anytime.

  3. How to on-demand scan a computer with McAfee Antivirus?

    (A) For Staff LAN PCs installed by the CSC

    For all computers installed by the Computing Services Centre (CSC), McAfee Antivirus Scanner should be installed with an ePO Agent, and this will force all necessary updates automatically to ensure the latest scan engine and virus data are updated. Please follow the steps below to complete the scanning.

    1. Assuming you are running either Windows 7 or Windows 8, press “Show hidden icons” button Show hidden icons at the bottom right corner of the taskbar, and in the pop-up window, right click on the McAfee iconMcAfee icon .

    2. Show Hidden Icons

    3. When a pop-up menu appears, click the menu option: “On-Demand Scan…”.

    4. Select "On-Demand Scan" option

    5. Press “Yes” button if the following notification window appears.

    6. Notification Window

    7. Before starting the scanning, make sure the actions are appropriate when a virus is found. To do this, click the “Actions” tag on the On-Demand Scan window. The recommended settings are: try first to Clean, if this fails, then perform Delete action (see below). The scanner will log down the actions taken during the scanning where you can find what files are cleaned or deleted; to check where the location of this log file, click the “Report” tag next to the “Actions” tag and press the “Browse…” button.

      On-Demand Scan Properties Window

    8. To start scanning, click on “Scan Locations” tag and select “All local drives” under the “Specify where scanning takes places.” and then press “Start” button. If you want to change the scanning location, press the “Add…” to add new location(s) or “Edit…” button to edit the selected scan location.


    9. On-Demand Scan Properties Window

    10. The following window will appear showing the progress of scanning process.


    11. On-Demand Scan Progress Window

      Please note that scanning a hard disk with size 500G may take several hours to complete. If this significantly slows down your computer and affects your work, you can initiate the scanning before leaving your office and leave the computer on to complete the scanning during the night. Furthermore, you may choose to pause or stop the scanning whenever necessary.

    (B) For Computers Installed by Users [Including Office PC (Not Joining Staff LAN) and Home PC]

    There are two types of computers under this category. For computers installed by users with a McAfee Antivirus setup disk borrowed from the Computing Services Centre (CSC), if properly installed, an ePO Agent will also be installed together with the scanning program. This ePO Agent will force all the necessary updates to the computers. However, for other computers which users purchase their own McAfee license (e.g. Home PC), the ePO Agent will not be installed. In this case, users need to do their updates manually by the following steps.

    1. Assuming you are running either Windows 7 or Windows 8, press “Show hidden icons” button Show hidden icons at the bottom right corner of the taskbar, and in the pop-up window, right click on the McAfee iconMcAfee icon .
      Show Hidden Icons

    2. When a pop-up menu appears, click the menu option: “Update Now…”.

      Select "Update Now" option


    3. When the update is completed, the above window will close automatically after 30 seconds.


    4. McAfee Agent Updater Window

    5. When the update is completed, the above window will close automatically after 30 seconds.

    6. When the virus scanner is up-to-date, follow the same steps (2 – 6) in (A) above to complete the scanning.

  4. Is my computer safe after the full scan?

  5. Performing a full scan on a computer is like doing a body check. Even though no virus is detected at the time, it does not mean that a computer is free from infection or immunized. Your responsibilities to keep your PC healthy by enabling real-time virus scan, by means of proactive precautions such as rebooting your PC at least once weekly to activate newly enforced security/anti-virus policies and doing a full virus scan of your computer periodically, can certainly lower the chance of virus infection as they help spot and clean the known malware/virus that possibly hides in your computer, which is a big step to reduce security risk and damage to your computer/data.

csc@cityu.edu.hk