You can also get these dll files by downloading and installing the Microsoft Visual C++ redistributable package. It's a free download and will spare you (and your users) from having to install Visual Studio. 

Please notice there are different redistibutable versions, each one corresponding to msvcrt 71, 80 and 90 with both x86 and x64 flavors. 
There are also different releases for each of these typically.  For example, the initial release or a service pack (like an SP1) release.  For example:

Microsoft Visual C++ 2005 SP1 Redistributable Package (x86)