Use the System File Checker tool to repair missing or corrupted system files. When critical Windows system files are missing or corrupted, some Windows features may stop working correctly or Windows may stop responding altogether.

Compatibility Administrator is a tool that includes prepackaged fixes that provide an easy way to fix a program that may not run correctly under Windows. The Compatibility Administrator utility is included in latest Application Compatibility Toolkit. To install the latest Application Compatibility Toolkit, follow these steps:

In the search box on the taskbar, type command prompt, and right-click or press and hold Command Prompt (Desktop app) from the list of results. Select Run as administrator, and then select Yes. Type DISM.exe /Online /Cleanup-image /Restorehealth (note the space before each "/"), and then press Enter.

To start the Disk Cleanup tool and specify the hard disk to be cleaned by using the command line, follow these steps: Click Start, and then click Run. c:\windows\SYSTEM32\cleanmgr.exe /d Drive Note In this command, the placeholder Drive represents the drive letter of the hard disk to be cleaned.

Startup Repair is a Windows recovery tool that can fix certain system problems that might prevent Windows from starting. It scans your computer for the problem and then tries to fix it so your computer can start correctly.

User Account Control (UAC) is designed to prevent unauthorized changes to Windows. When an action requires administrator-level permissions, UAC prompts you to approve or deny the change. This helps protect your Windows device from malicious software and unauthorized modifications.

PC Health Check app brings you up to date info on your Windows device health, helping you take action to improve your device performance and troubleshoot performance problems. It is periodically updated based on customer feedback to help you make the most of your Windows PC. How to open PC Health Check.

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.

Learn how to optimize system performance by managing startup applications in Windows.

Allow elevation: Allows the app to run with administrator privileges without prompting the user first. App diagnostics: Get diagnostic information about other running apps. Bluetooth: Activate and use any Bluetooth connections between your device and other devices. Calendar: Access your calendars.