Need help to add ATTINY and ATMEGA328 (solved)

Hi,

I just upgraded my Arduino software to the last version and I am no longer able to choose ATTINY in the board list. I have tried to add it in the hardware folder but it does not work. Can someone help me? I also want to program ATMEGA328PU chips.

windows version: 7 64 bit Arduino version: 1.5.4 Board: UNO R3

How did you solved? I have the same problem