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安裝 Microsoft Defender - Microsoft 支援服務
安裝 Microsoft Defender，保護您的Android、iPhone、Mac和 Windows 裝置免於受到威脅。 在您的裝置上下載 Microsoft Defender，方法如下： 掃描下列 QR 代碼 在 App Store 中搜尋 Microsoft Defender 與您的裝置共用，下列連結： 複製連結 我們鼓勵您為每個人至少在五部裝置上安裝 Microsoft Defender。 準備好試試看了嗎？
Applies To:
Microsoft Defender on Android, Microsoft Defender on iOS, Microsoft Defender on Mac, Microsoft Defender on Windows
How to redeem gift cards and codes | Xbox Support
Learn how to redeem prepaid codes for Xbox games, subscriptions, or downloadable content using your account.
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Repair apps and programs in Windows - Microsoft Support
Select Start > Settings > Apps > Apps & features. Apps & features in Settings Select the app you want to fix. Select Advanced options under the name of the app (some apps don't have this option). In the page that opens, select Repair if it's available. If it isn't available or doesn't fix the problem, select Reset.