I'm using Ubuntu 12.04 unity (the problem was there before i upgrade) with an Intel® Pentium(R) 4 CPU 2.66GHz and my problem is that the CPU usage gets to 100% whenever i open an application and sometimes it crashes this is a snapshot of the system monitor : http://farm8.staticflickr.com/7078/7042247815_480c37aeb0_b.jpg
if there is a way to lower it i ll be thankful if you tell me