Sorry for resurrect this topic, but i want to post my solution to this problem:
erase all "IR's" libraries (from arduino nightly and from Documents>Arduino>libraries)
if you have the Cd search for IRremote.zip in 37 SENSOR KIT TUTORIAL FOR UNO (this is a example of MY cd, search on yours)
then in the Arduino IDE Program>Include Librarie>Add librarie.zip.. search for your IRremote.zip
that's all, in your code:
#include <IRremote.h>
#include <IRremoteInt.h>
"your code"
That was my solution, I hope helped someone