avr-g++: error: CreateProcess: No such file or directory Error compiling.

I'm running a;

Dell Inspiron I1520 Intel DuoCore CPU T7300 @2.00 Ghz 2046 MB of Ram - 32-bit

this is what comes up when we try to verify or upload.

Arduino: 1.6.4 (Windows Vista), Board: "Arduino Uno"

Build options changed, rebuilding all

C:\Program Files\Arduino\hardware\tools\avr/bin/avr-g++ -c -g -Os -w -fno-exceptions -ffunction-sections -fdata-sections -fno-threadsafe-statics -MMD -mmcu=atmega328p -DF_CPU=16000000L -DARDUINO=10604 -DARDUINO_AVR_UNO -DARDUINO_ARCH_AVR -IC:\Program Files\Arduino\hardware\arduino\avr\cores\arduino -IC:\Program Files\Arduino\hardware\arduino\avr\variants\standard C:\Users\R1H2\AppData\Local\Temp\build4295892310958315852.tmp\Blink.cpp -o C:\Users\R1H2\AppData\Local\Temp\build4295892310958315852.tmp\Blink.cpp.o

avr-g++: error: CreateProcess: No such file or directory Error compiling.