If your computer’s operating system is corrupted, there are several tools and methods you can use to detect, repair, or restore it. Here’s a list of commonly used tools (both built-in and third-party):

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1. Built-in Windows Tools (for Windows OS)

a. System File Checker (SFC)

• Command: sfc /scannow
• Repairs missing or corrupted system files.

b. Deployment Imaging Service and Management Tool (DISM)

• Command: DISM /Online /Cleanup-Image /RestoreHealth
• Repairs the system image.

c. Startup Repair

• Access from Windows Recovery Environment (WinRE)
• Automatically fixes boot errors.

d. System Restore

• Reverts the system back to a previous working state (restore point).

e. Reset This PC

• Reinstalls Windows without affecting personal files (if chosen).

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2. Bootable Recovery Tools

a. Windows Installation Media (USB/DVD)

• Repair or reinstall the OS using a bootable device.
• Use Microsoft’s Media Creation Tool to create one.

b. Hiren’s BootCD PE

• A live Windows environment with dozens of repair tools.

c. Ultimate Boot CD (UBCD)

• Includes diagnostic tools for system, memory, and hard drive errors.

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3. Disk and Partition Tools

a. CHKDSK

• Command: chkdsk /f /r
• Fixes disk-related errors.

b. MiniTool Partition Wizard

• Can fix partition table errors and rebuild MBR.

c. EaseUS Partition Master

• Useful for partition recovery and resizing.

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4. Linux-based Rescue Tools

a. SystemRescue

• A powerful Linux-based bootable tool for data recovery and disk repair.

b. Ubuntu Live USB

• Mount and access files or backup before reinstalling OS.

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Do you know what symptoms you’re seeing—blue screen, boot loop, or file corruption? I can recommend more specific tools based on that.