Why does ClamWin anti-virus cause my Windows 7 PC to freeze?

Cristián T May 28, 2014

So I tried running a ClamWin scan on my laptop running Windows 7 Professional 64-bit, and in the middle of the scan, my laptop freezes and I am forced to reboot the system.

Please help me find out what is causing my computer to freeze every time I run a ClamWin virus scan, and how I can prevent it from happening.

  1. Oron J
    May 29, 2014 at 9:40 am

    I agree with Jan's analysis. The fact the two AV solutions crash at (roughly) the same point suggests that the problem is not with them, but lies elsewhere.

    In addition to Jan's suggestions, you could try a bootable AV scanner to check the system. There are several such discs available (e.g. Kaspersky Rescue Disk, Avira Rescue System) and they can be downloaded and installed on CD or a USB drive. Scanning a drive from a bootable drive is slow, and if the system crashes again you'll know it is due to a hardware problem rather than software (or due to damaged blocks on the drive).

  2. Dalsan M
    May 29, 2014 at 7:02 am

    Is there a specific file that the scan stops at and starts freezing on? It may be that there is corruption with the file, such as a Windows Installer file, that ends up causing the computer to freeze.

  3. Jan F
    May 29, 2014 at 6:41 am

    Since your freeze doesn't seem to be program related (happens with two different tools) my guess would either be heat, bad blocks on the hard drive or some damaged system file.

    Run a hard drive check:
    right-click your hard disk and select properties
    click the Tools tab and hit the "check now" button at the Error-checking section
    check both boxes and then click start
    * you will have to reboot Windows for it to run

    Run a system file check:
    click Start, search for "cmd", then right-click 'Run as administrator' on the command prompt
    type "sfc /scannow" and hit enter into the command prompt

    check the thermals of your system:
    HWMonitor usually works for most systems to read hardware information

  4. Rajaa C
    May 29, 2014 at 2:53 am

    Uninstall ClamWin, install AVG Antivirus FREE edition 2014 from http://free.avg.com/in-en/homepage . I have used it in Win7_64 and now using in Win8_64 and am pretty satisfied with it. :)

    • Cristián T
      May 29, 2014 at 3:48 am

      Thank you for the advice, but this question is about ClamWin, not AVG.

  5. Hovsep A
    May 28, 2014 at 8:57 pm

    maybe to check with another to see the problem repeat
    Microsoft Safety Scanner

    if you open task manager and check RAM and CPU are they at 100%?

    • Cristián T
      May 29, 2014 at 3:55 am

      So I tried running a scan with Microsoft Safety Scanner. The same thing happened, the computer froze in the middle of the scan.

    • Hovsep A
      May 29, 2014 at 8:09 am

      are they both freezing when scanning the same file?
      if you have another security tool with realtime protection then this can explain the problem.

      you can try clean boot and scan to see if this will solve software conflict.

      if you have external drives plugged then remove while scanning

    • Alex T
      May 30, 2014 at 1:25 am

      I don't know what file causes my computer to freeze whenever it is being scanned by ClamWin or Microsoft Safety Scanner. All I know, is that during both deep system scans my computer froze, preventing the scan from properly finishing and allowing me to use the computer until I force-reboot the system.

    • Hovsep A
      May 30, 2014 at 1:21 pm

      did you try clean boot and scan?

      well if it is the same file and is somehow blocked not accessible for scan then this can explain.
      the clamwin log scan file can be here
      C:UsersAll Users.clamwinlogClamScanLog.txt
      maybe can tell you which file is causing this

      you can try to boot on live cd and do the scan, clean then retry clamwin if still freeze then this can be a bug? but the problem Microsoft Safety Scanner is freezing also then can be a malware difficult to delete it!

      you can try also if you would like Comodo Cleaning Essentials

    • Alex T
      May 30, 2014 at 10:04 pm

      Yes, I tried a clean boot scan. Also, there is no directory that matches the one you specified on my computer.

    • Hovsep A
      May 31, 2014 at 7:30 am

      if you go to tools in Clamwin and click on preferences then under Reports you can check the ClamScanLog.txt location

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