mxmlc Error Loading: "D:\Program Files\Java\jre6\bin\server\jvm.dll"
mxmlc which is the flex compiler requires that you have Java Runtime Environment installed in you system which in particular must be 32 bit (at present).

The error Error Loading: "D:\Program Files\Java\jre6\bin\server\jvm.dll" shown means you are using the 64 bit JRE. You need to point to a 32 bit version.

Open the Environment Variable window and configure as shown in the screenshot. Create a new variable called JAVA_HOME with value pointing to the 32 bit version of JRE. In my case its D:\Program Files (x86)\Java\jre1.6.0_07\.

Now mxmlc should work.

This application failed to start because msvcp71.dll was not found. Re-installing the application may fix this problem.

Download from dlldll.

FLASH DEVELOP ERROR:

Debugger startup error: System.DllNotFoundException: jvm.dll

See reference here.