The sign-in options in Windows serve various purposes to enhance your user account security and sign in convenience. You can access the sign-in options from the Settings app.

Windows の回復オプションについて説明します。 PC を初期状態に戻す方法、以前のバージョンの Windows に戻す方法、メディアを使って Windows を再インストールする方法を説明します。

Use System restore to make restore points when you install a new app, driver, or Windows update, and when you create a restore point manually. Restoring won’t affect your personal files, but it will remove apps, drivers, and updates installed after the restore point was made. To go back to a restore point:

If you’ve forgotten your Microsoft account password, learn how to do a password reset online or by using your Xbox console.

Learn more about how to fix problems with the Windows Start menu, and what to do if the Start menu won't open.

Office または Microsoft 365 を購入したときにプロダクト キーが付属していた場合は、使用している製品に対応する以下の Web サイトのいずれかにプロダクト キーを入力します。

If you don't want to sync all of your folders in OneDrive to your computer, you can use the OneDrive app for Windows and macOS to select which folders you'd like to have visible in File Explorer or Finder.. When viewing Windows or Mac via a web browser or mobile app, you will always see all your folders.

Use Remote Desktop on your Windows, Android, or iOS device to connect to a Windows 10 PC from afar. Here's how to set up your PC to allow remote connections and then connect to the PC you set up.

Get help with signing in, changing passwords, creating and sending mail, deleting mail, creating folders, and more in Outlook on the web.

If you didn't receive a confirmation email, select Resend on the Order History page to get another copy sent to you. If you need to change that primary email address, see Change my Microsoft Rewards primary email .