Use the System File Checker tool to repair missing or corrupted system files


Windows 8.1 or Windows 8

swipe in from the right edge of the screen, and then tap Search. Or, if you are using a mouse, point to the lower-right corner of the screen, and then click Search. Type Command Prompt in the Search box, right-click Command Prompt, and then click Run as administrator. If you are prompted for an administrator password or for a confirmation, type the password, or click Allow.

Windows 10, Windows 7, or Windows Vista

To do this, click Start, type Command Prompt or cmd in the Search box, right-click Command Prompt, and then click Run as administrator. If you are prompted for an administrator password or for a confirmation, type the password, or click Allow.

If you are running Windows 10, Windows 8.1 or Windows 8, first run the inbox Deployment Image Servicing and Management (DISM) tool prior to running the System File Checker.

(If you are running Windows 7 or Windows Vista, skip to Step 3.)

Type the following command, and then press Enter.

It may take several minutes for the command operation to be completed.

DISM.exe /Online /Cleanup-image /Restorehealth

Important: When you run this command, DISM uses Windows Update to provide the files that are required to fix corruptions. However, if your Windows Update client is already broken, use a running Windows installation as the repair source, or use a Windows side-by-side folder from a network share or from a removable media, such as the Windows DVD, as the source of the files. To do this, run the following command instead

Fragmentation makes your hard disk do extra work that can slow down your computer. Removable storage devices such as USB flash drives can also become fragmented. Disk Defragmenter in Windows rearranges fragmented data so your disks and drives can work more efficiently. Disk Defragmenter runs on a schedule, but you can also analyze and defragment your disks and drives manually. To do this, follow these steps:

Defragment your hard disk to improve Computer performance

  1. Open Disk Defragmenter by clicking the Start button . In the search box, type Disk Defragmenter, and then, in the list of results, click Disk Defragmenter.
  2. Under Current status, select the disk you want to defragment.
  1. To determine if the disk needs to be defragmented or not, click Analyze disk. If you're prompted for an administrator password or confirmation, type the password or provide confirmation.

    Once Windows is finished analyzing the disk, you can check the percentage of fragmentation on the disk in the Last Run column. If the number is above 10%, you should defragment the disk.
  2. Click Defragment disk.

If you're prompted for an administrator password or confirmation, type the password or provide confirmation.

Disk cleanup (Windows 10 S (2017),Windows 10 (2015) - MS Version 6.4,Windows 8/8.1 (2012-2013) - MS Version 6.2/6.3,Windows 7 (2009) - MS Version 6.1,Windows Vista (2006) - MS Version 6.0)

Delete temporary files:

In the search box on the taskbar, type

disk cleanup, and select Disk Cleanup from the list of results.

Select the drive you want to clean up, and then select

OK.

Under Files to delete, select the file types to get rid of. To get a description of the file type, select it.

Select OK.

  • If you need to free up more space, you can also delete system files:

In Disk Cleanup, select Clean up system files.

Select the file types to get rid of. To get a description of the file type, select it.

Select OK.

Repair Office application

Windows 10

Right-click the Start button (lower-left corner), and select Apps and Features on the pop-up menu

Select the Microsoft Office product you want to repair, and select Modify.

Note:

This will repair the entire Office suite even if it's just one application you want to repair such as Word or Excel. If you have a standalone app installed, then search for that application by name.

Depending if your copy of Office is Click-to-run or MSI-based install, you'll see the following options to proceed with the repair. Follow the steps for your installation type.

Click-to-run

In the window How would you like to repair your Office Programs, select Online Repair > Repair to make sure everything gets fixed. (The faster Quick Repair option is also available, but it only detects and then replaces corrupted files.)

MSI-based

In Change your installation, select Repair and then click Continue.

Windows 8

Right-click the Start button (lower-left corner), and select Control Panel from the pop-up menu.

From Category view, under Programs, select Uninstall a program.

Right-click the Microsoft Office product you want to repair, and from the drop-down, select Change.

Note:

If you have a suite such as Microsoft 365 Family, Office Home & Student 2016, or Office Home and Student 2013, search for the suite name, even if it's just a particular application you want to repair such as Word or Excel. If you have a standalone application such as Word or Excel, search for the application name.

Depending if your copy of Office is Click-to-run or an MSI-based install, do the following for your Office installation type:

Click-to-Run installation type:

In How would you like to repair your Office Programs, select Online Repair to make sure everything gets fixed, and then select Repair. (The faster Quick Repair option is also available, but it only detects and then replaces corrupted files.)

Windows 7 and Vista

Click the Start button > Control Panel. From Category view, under Programs, select Uninstall a program.

Click the Office product you want to repair, and then click Change.

Note:

If you have a suite such as Microsoft 365 Family, Office Home & Student 2016, or Office Home and Student 2013, search for the suite name, even if it's just a particular application you want to repair such as Word or Excel. If you have a standalone application such as Word or Excel, search for the application name.

Depending if your copy of Office is Click-to-run or an MSI-based install, do the following for your Office installation type:

Click-to-Run installation type:

In How would you like to repair your Office Programs, select Online Repair to make sure everything gets fixed, and then select Repair. (The faster Quick Repair option is also available, but it only detects and then replaces corrupted files.)

MSI-based installation type:

In Change your installation, select Repair and then click Continue.

Still the issue is not fixed ?

Remove and reinstall Office suite

Open control panel -Click on uninstall programs and features-Search for Microsoft Office in the list.

Select Microsoft Office and click on uninstall.

Go to www.office.com and if you’re not already signed in, select

Sign in

Sign in with the account you associated with this version of Office. This account can be a Microsoft account, or work or school account.

After signing in, follow the steps that match the type of account you signed in with

  1. From the Office home page select

Install Office.

Select Install (or depending on your version, Install Office>).

Install Office From your browser, select

Run (in Edge or Internet Explorer), Setup (in Chrome), or Save File (in Firefox).

If you see the User Account Control prompt that says,

Do you want to allow this app to make changes to your device?

select Yes.

The install begins.

You’re all set! Office is installed now