Firefox Portable on RamDisk

I am attempting to install and run Firefox Portable on a RamDisk. My machine is running Windows 7 and followed a Wiki How article: "http://www.wikihow.com/Speed-Up-Firefox-by-Running-It-In-RAM" which was apparently written for Windows XP users. I modified the procedure for Windows 7 using TaskManager to run the batch files to copy and save Firefox and it appeared that everything was set up correctly. Nevertheless, when I attempt to open Firefox I get the message that Mazilla Runtime could not be found. I downloaded Firefox again, but continue to get the same error message. Any ideas?