You need Busybox. When you obtain Root, and you are 100% sure you have Root, then run Option 18 to Install Google Play Store, this will install Busybox, we just added this feature tonight at 02:19am PST GMT -8.
As a matter of fact we added the Busybox installer to every option to it does not matter which one you use, they will all first check for a Busybox install and if you do not have it installed, our software will perform a Smart Busybox install with full Symbolic link support.
Please do not select any of the options other than 21 until we know you have Root, OK? Root Checker Basic is very reliable.
*****Kindle Fire First Aide Revision 4.1.60-Beta RunMe 02/24/13 at 02:19 for Microsoft Windows*****
Kindle Fire First Aide Revision 4.1.60-Beta for RunMe.bat Package: RunMe.zip
Kindle Fire First Aide Revision 4.1.60-Beta for Windows Universal Package: KFFirstAide.zip (Dropbox)
Kindle Fire First Aide Revision 4.1.60-Beta for Windows 32-bit Version: KFFirstAide32.zip (Dropbox)
Kindle Fire First Aide Revision 4.1.60-Beta for Windows 64-bit Version: KFFirstAide64.zip (Dropbox)
7-Zip for Windows 32-bit: Download
7-Zip for Windows 64-bit: Download
Oracle Java SE Update: Java SE Development Kit 7u15
Oracle Java SE 7u15 32-bit : jdk-7u15-windows-i586.exe
Oracle Java SE 7u15 64-bit : jdk-7u15-windows-x64.exe