I was installing a program for testing and received the following error:
The program can't start because pthreadVC2.dll is missing from your computer. Try reinstalling the program to fix this problem.
Strange error as the dll was in the install directory.
After attempting a few things; the problem was the UNC for the install/work directory was missing from the system path. Made a change and the error went away.
Such is the fun involved with alpha testing.