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Reinstall Office After Formatting Your PC (Key or Account)

Updated 5 October 2026 ยท by Swastik Enterprises

You formatted the PC, or Windows was reinstalled by a technician, and now Word has disappeared. Don't worry: your Office licence still exists. You only need to install it again and activate it. The steps depend on how you originally activated.

First, find your licence details

  • Check your order email, or My Licence Keys in your KeyForPC account.
  • If Office was linked to a Microsoft account, remember which email you used.

Case 1: Office linked to a Microsoft account (Account Bind)

  1. On the PC, sign in at account.microsoft.com/services.
  2. Find your Office product and click Install.
  3. Run the installer. Office activates automatically when you sign in.
Office Professional Plus 2021 (Account Bind)โ‚น6,299.00 โ‚น8,999.00Check availability โ†’

Case 2: Product key only (Phone Activation)

  1. Download the installer from the official link in your order.
  2. Install Office and enter the same key in Word.
  3. If online activation says the limit was reached, choose Activate by telephone. Steps are in our phone activation guide.
Office Professional Plus 2021 (Phone Activation)โ‚น108.00 โ‚น129.00Check availability โ†’

Case 3: Home or Home & Student

These are usually tied to a Microsoft account. Sign in at the same place as in case 1.

Office Home & Student 2021โ‚น599.00 โ‚น2,999.00Check availability โ†’

Before you format next time

  • Back up documents, Outlook data (.pst), browser bookmarks and passwords.
  • Copy your Office key into your account's notes or a password manager.
  • Note your installed Office version and 32/64-bit.

Frequently asked questions

Will my Word documents be lost?

Files on the formatted drive are gone unless backed up. Office itself doesn't hold your documents.

How many times can I reinstall Office?

Many times on the same PC. Moving to a different PC may need phone activation.

My key says it's used. What now?

That usually means online limits were reached. Use phone activation, or contact us with your order number.

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