Oh ok this is what it is:
core.a(Tone.cpp.o): In function
__vector_13': C:\Users\Habib\Downloads\arduino-1.0.1-windows (2)\arduino-1.0.1\hardware\arduino\cores\arduino/Tone.cpp:523: multiple definition of__vector_13'
arduinoirremote\IRremote.cpp.o:D:\Tech\Arduino\libraries\arduinoirremote/IRremote.cpp:311: first defined here
c:/users/habib/downloads/arduino-1.0.1-windows (2)/arduino-1.0.1/hardware/tools/avr/bin/../lib/gcc/avr/4.3.2/../../../../avr/bin/ld.exe: Disabling relaxation: it will not work with multiple definitions