The document discusses how to fix the "msvcr100.dll is missing" error that can occur on Windows systems. It describes how msvcr100.dll is a Microsoft Visual C++ file needed by some applications. It recommends downloading and installing the latest Visual C++ redistributable package for your system as a first step. If that doesn't work, it provides additional manual steps to try like scanning for malware, using system restore, reinstalling programs, and installing Windows updates. It also suggests checking memory and hard drives, and using a repair tool as a last resort if the issue still isn't fixed.