Check which Updates were installed right before the problem began, and if necessary uninstall them from Settings > Update & Security > Windows Update > Installed Update History. ![]() This may have been caused by Windows Updates. If you type Defender Security Center in Start Search, open it, then choose Virus and Threat Protection Settings, is Controlled Folder Access turned On?Īlso in Security Center under App and Browser Control, is Check Apps and Files set to Block? Change to Warn. ![]() To clean it up run Avast Clear after uninstall to check for leftovers: If you want the best on-demand scanners install and run Malwarebytes and AdwCleaner free scanners. I would uninstall any 3rd party antivirus and try running only built-in Defender which gives adequate protection, least issues, and is from Microsoft who knows how to protect their OS best. No expert in Forums where we see the most cases (by the tens of thousands) has recommended Avast for 7-8 years since it bloated up and started causing issues, but we do solve problems by having it uninstalled. I'm Greg, an installation specialist and 8 year Windows MVP, here to help you.
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