avr studio software

hello.
Can any body help me for avr studio software.

hello sir,
i have installed AVR stdio 4, but i m getiing following error after run & building..........
Loaded plugin Proteus VSM Viewer
Loaded plugin STK500
gcc plug-in: No AVR Toolchain installation found. The AVR GCC plug-in can still be used if you set up your own build tools.
Loaded plugin AVR GCC
Loaded partfile: C:\Program Files (x86)\Atmel\AVR Tools\PartDescriptionFiles\ATmega16.xml
gcc plug-in: No AVR Toolchain installation found. The AVR GCC plug-in can still be used if you set up your own build tools.
gcc plug-in: Output directory C:\Users\yashshailesh\Desktop\default\ does not exist
gcc plug-in: No AVR Toolchain installation found. The AVR GCC plug-in can still be used if you set up your own build tools.
gcc plug-in: No AVR Toolchain installation found. The AVR GCC plug-in can still be used if you set up your own build tools.
gcc plug-in: No AVR Toolchain installation found. The AVR GCC plug-in can still be used if you set up your own build tools.
gcc plug-in: No AVR Toolchain installation found. The AVR GCC plug-in can still be used if you set up your own build tools.

please help me....very thanks to you....

@ dspicmicro
its look llike AVR Toolchain is missing

thanks,
now, but i have installed studio-6 it is working fine...

@ dspicmicro
that has many plug in built in