Fix problems that block programs from being installed or removed
Block you from uninstalling a program through Add or Remove Programs (or Programs and Features) in Control Panel. If you're trying to remove malware, you can use Windows Security (or another antivirus tool), or you can use the Windows Malicious Software Removal tool.
Repair Outlook Data Files (.pst and .ost) - Microsoft Support
You can use the Inbox Repair tool (SCANPST.EXE) to diagnose and repair errors in your Outlook data file. The Inbox Repair tool checks the Outlook data files on your computer to see if they're in good shape. You might want to use the Inbox Repair tool in the following situations:
Applies To:
Outlook for Microsoft 365, Outlook 2024, Outlook 2021, Outlook 2019, Outlook 2016
Add an exclusion to Windows Security - Microsoft Support
Find out how to stop Windows Security from alerting you about or blocking a trusted file, file type, or process, by adding it to the exclusions list.
Blocked attachments in Outlook - Microsoft Support
Learn more about why Microsoft 365 users can't open or view attachments in Outlook on the web. There are several ways to send and receive a blocked file.
Applies To:
Outlook for Microsoft 365, Outlook 2024, Outlook 2021, Outlook 2019, Outlook 2016
Use the System File Checker tool to repair missing or corrupted system ...
To resolve this problem, perform the System File Checker scan in safe mode, and make sure that the PendingDeletes and PendingRenames folders exist under %WinDir% \WinSxS\Temp. Windows Resource Protection found corrupt files and successfully repaired them. Details are included in the CBS.Log %WinDir% \Logs\CBS\CBS.log.
How to troubleshoot Windows Installer errors - Microsoft Support
To fix this problem automatically, run the "Fix problems that programs cannot be installed or uninstalled" troubleshooter to repair issues that block program installation or removal because of corrupted registry keys. Important To perform many of the methods and steps in this article, you must be logged on to your computer as an administrator.
What to do when a malicious file is found in SharePoint Online ...
You've come across a file in SharePoint in Microsoft 365, OneDrive for work or school, or Microsoft Teams, but you're unable to open or share it. You can see the file is there, but it's blocked and the file has a warning icon next to it: To protect yourself, your computer, and your organization, the best option is to delete the file.
Applies To:
SharePoint in Microsoft 365, Microsoft 365 admin, OneDrive (work or school), Microsoft Teams, OneDrive for Mac, OneDrive for Windows, SharePoint admin center
Protect your PC from potentially unwanted applications
Potentially unwanted app blocking was first introduced in the Windows 10 May 2020 update and is turned off by default for enterprise and consumer customers. Note: Beginning in September of 2021 we will only be blocking cryptomining software as PUA for enterprise customers. How do I configure it?
"Access Denied" or other errors when you access or work with files and ...
When you try to access or work with files and folders in Windows, you experience one or more of the following issues: Issue 1: You receive an "Access Denied" error message or a similar message. Issue 2: You cannot access, change, save, or delete files and folders. Issue 3: You cannot open a file or folder after you install a new version of Windows.
Ransomware detection and recovering your files - Microsoft Support
Ransomware detection notifies you when your OneDrive files have been attacked and guides you through the process of restoring your files. Ransomware is a type of malicious software (malware) designed to block access to your files until you pay money.
Applies To:
OneDrive (home or personal), OneDrive for Mac, OneDrive for Windows