I did looked McFee and it showed no virus. Weird. Funny last week fine now it pop up "Couldn't download- virus scan failed. What should I do and please do step by step.
Jean
If you received a post from to call a "Level 4 Microsoft Representative" do not call that number - you need to ignore that scam message.
You “possibly” have a copy of McAfee Site Advisor or WebAdvisor or some other McAfee product on your computer that’s causing this issue. If so, you need to uninstall it and also be sure to use the McAfee Consumer Products Removal Tool as well. List of antivirus product removal tools If necessary boot into Safe Mode with Networking and try to download the tool and run it or you can use a different computer, put the removal tool on a flash drive and then insert the flash drive in the affected computer and run it from there. After removingall traces of McAfee and rebooting the computer this issue “should” be resolved…emphasis on should.
Here is a recent thread where the original poster reported a similar issue: https://answers.microsoft.com/en-us/protect/forum/all/all-downloads-are-flagged-as-having-a-virus-and/bd56236c-8bc7-44ff-8208-a7043d2785e4
And here is another: https://answers.microsoft.com/en-us/protect/forum/all/failed-virus-scan-fail-with-windows-10-latest/dc618827-4437-41d9-9e99-17000480eb6f
Or
This issue previously was sometimes caused by the Sirefef Virus but we don’t receive many reports of that malware still being prevalent on the internet. https://malwaretips.com/blogs/trojan-zeroaccess-removal/
Regards...
http://blog.emsisoft.com/2015/01/27/top-10-ways-pups-sneak-onto-your-computer-and-how-to-avoid-them/