I made a program in Visual Studio 2010 on Windows 7 64-bit. When I try to run it on Windows XP 32-bit I got message that msvcr100.dll is missing. When I try to copy that fil
First you need to make sure you're building a 32 bit executable - 64 bit ones won't run on 32 bit Windows.
Then you can either...
Project -> Properties -> Configuration Properties -> C/C++ -> Code Generation -> Runtime Library to Multi-threaded (/MT).