I installed Camstudio on Windows7 64 and received an error, "the application has failed to starty because its side-by-side configuration is incorrect", when I tried to run the recorder. At first I was confused and then after looking up the error I realized I needed to install a C++ component.
I installed this: Microsoft Visual C++ 2008 SP1 Redistributable Package (x86) on my Windows 7 64 bit machine. I had also tried the (x64) version but that didn't work...I assume because the software is built for non-64 bit processors.
I was originally going to post asking how to fix this error but now I am good to go I think.