Learn about modems and Internet connections, security, sharing files and printers, and how to set up a wireless network in your home.

Probieren Sie diese Lösungen aus, wenn Sie sich nicht bei Ihrem Outlook.com-, Hotmail-, Live- oder MSN-E-Mail-Konto anmelden können oder nicht sicher sind, wie Sie sich an- oder abmelden.

See how to install Project 2013 and 2016 and Project Pro for Office 365.

Note: If you start to play a DVD or VCD in the Player Library, the Player automatically switches to Now Playing mode. The Blu-ray Disc format is not supported in Windows Media Player. To play a Blu-ray Disc, you need to use a non-Microsoft program that supports Blu-ray playback and a device capable of reading Blu-ray Discs.

Learn how to activate Windows using a product key or digital license, check your activation status, and link your Microsoft account.

Find out how to set up and manage your security info and verification codes for your Microsoft account, and troubleshoot common issues.

How to use the COUNTIF function in Excel to count the number of cells that meet values you set.

Create a system restore point. Communities help you ask and answer questions, give feedback, and hear from experts with rich knowledge.

Learn how to reset your PIN if you aren't signed in to Windows and having trouble using your PIN.

Change the capitalization of text to lowercase, UPPERCASE, Capitalize First Word, or Sentence case in your documents.