Step 1: Head to the DLL-Files website and – in the right-hand column – click the Download Zip File button. This is a trusted site, but you can also find the file on other websites, such as Fix4dll. When presented with a list of various versions, choose the one appropriate to your system: 32-bit or 64-bit. Go for the latest version.
Step 2: Unzip the file you just downloaded – double-clicking on the file (which is likely to be in your Downloads folder unless you specified a different download directory) will open it using Windows’ built-in support for zip files.
Step 3: Extract the file msvcr100.dll to you the C:WindowsSystem32 folder – this assumes you have used the default hard drive letter for Windows. If your system is running 64-bit Windows, also copy the file to C:WindowsSysWOW64. (If that folder doesn’t exist, you probably don’t have 64-bit Windows.)
Step 4: Launch the application or game that caused the error, and it should now run – or complain that another DLL file is missing. If it still asks for the same file, try rebooting your computer and if that doesn’t fix it, then copy msvcr100.dll to the application or game’s installation folder in C:Program Files or C:Program Files (x86).