I am loading everything on a laptop that I'm using to go back and forth to a college class. Specifically, I downloaded the PHP folder directly to the C: drive as Kevin Yank's book suggests. I thought that it should go into the Program Files folder of the C: drive, but that's not what his book said to do. I clicked on the PHP folder, and some of the files say php5 (php5.dll, php5apache2_2.dll, php5apache2.dll, and so on), and underneath they say 22.214.171.124, so I guess I have version 5.2. I clicked on the Zip link and extracted the files, but I'm not sure about Thread Safe. There was a newer version of PHP on their site, but that is not what Kevin's book said to use, so I went for the version he suggested.
Apache Software Foundation folder is in Program Files folder of C: drive. It's version 2.2.