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Hi Laurier,

As a solution, we suggest that to run the PowerShell command to reset Microsoft Edge and see if that resolves the problem.

Here's how:

1. Click Start and search for C:\Users%username%\AppData\Local\Packages\Microsoft.MicrosoftEdge_8wekyb3d8bbwe.
2. Click on the search result and go back once. The exact folder will be highlighted under Packages.
3. Delete the said folder by pressing SHIFT + Delete.
4. Click on Start again and search for Windows Powershell.
5. Right-click on the first result and select Run as Administrator.
6. Copy the command below:

Get-AppXPackage -AllUsers -Name Microsoft.MicrosoftEdge | Foreach {Add-AppxPackage -DisableDevelopmentMode -Register "$($_.InstallLocation)\AppXManifest.xml" -Verbose} 7. Paste the command on the Windows Powershell prompt and then press Enter. 8. Restart the PC.

Let us know how it goes.

I have tried using several different adware removal tools; including Kaspersky, Windows Defender, Microsoft Essentials, AdwCleaner, Malwarebytes, and more.

The showad.js download request only occurs when using Edge to access my Yahoo account.

When I go to other web sites it does not occur.

I have tried deleting all cookies with no results.

Even after I delete cookies and I check the "view source" of the web page this particular cookie is still there.

I have tried deleting all history with no results.

I have gone into the Microsoft Edge Cache file and found a java script file showads.js and deleted it, but still no success in removing.

When using Firefox and Explorer browsers this request doesn't pop up.

Below is a screen print.

http://answers.microsoft.com/en-us/windows/forum/windows_10-networking/edge-automatic-download-of-showadjs-file/2ef8bcc0-7bf0-4135-8987-1af9740afc06

https://malwaretips.com/blogs/remove-ads-pubmatic-com/

http://answers.microsoft.com/en-us/protect/forum/protect_other-protect_scanning/adspubmaticcom/b2909a5f-c4ec-4d32-b05a-839fe1c1e824

I ran AdwCleaner, Malwarebytes, Hitman Pro.  I deleted cookies and temp files.  I ran my Kaspersky virus scan with settings set to maximum detection,  and Windows Defender.  The problem still persists when logged onto my Yahoo home page or mailbox, using Microsoft Edge.  I will try to reset my browser settings (if I can figure it out).  I tried to paste a screenshot to this reply, but couldn't.

Have you sought assistance from your antimalware provider (Avast, AVG, Avira, McAfee, Norton, etc)?

Any "new" browser extensions added that you need to disable or remove?

For issues with popups while using Edge see the Answer of GreginMich dated June 20, 2016: http://answers.microsoft.com/en-us/protect/forum/protect\_other-protect\_scanning/1-888-2361-scam/0990122e-61a9-431b-947e-a904c202fa7c

For issues with Google Chrome see How to stop unwanted pop-ups or homepage changes in Chrome, and How to reset Google Chrome settings. You may want to use https://www.google.com/chrome/cleanup-tool/

If the popups continue see the following free multi-step removal guide from Malwaretips.com: https://malwaretips.com/blogs/remove-popup-ads-windows-10/  

To remove pop-up ads and malware from Windows 10, follow these steps:

STEP 1: Scan your computer with AdwCleaner

STEP 2: Scan your computer with Malwarebytes Anti-Malware

STEP 3: Double-check for malware with HitmanPro

(OPTIONAL) STEP 4: Scan your computer with Zemana AntiMalware

(OPTIONAL) STEP 5: Reset your browser to default settings

You may not need to use Hitman Pro (Trial Version) or Zemana (also a trial version) as suggested in step 3 and step 4 but you may need to reset your browsers (see step 5).

http://www.howtogeek.com/237527/how-to-reset-microsoft-edge-in-windows-10/

http://www.groovypost.com/howto/windows-10-anniversary-update-change-the-default-browser/ Good article but ignore the ads.

Good luck...

https://blog.malwarebytes.org/online-security/2016/02/how-to-avoid-potentially-unwanted-programs/