When your Computer or PC CPU usage reads 100%- What to do

 I was browsing the internet with my Google chrome browser and all of a sudden the system was hanging. I mean seriously freezing and dragging. Coincidentally, i was downloading a musical track by Sami Yusuf and thought that the song i was downloading had released a virus into my PC. I was so furious cos it hindered me from doing a lot of stuff which i was supposed to have done. I restarted the PC several times but to no avail.I started the task manager and notice that CPU usage was 100%! It immediately hit me that this must be the cause of the problem.
 I had to stop to think for a moment and to flash back to an earlier time when the system was running smoothly and activities i carried out at that point before it started messing up. It wasn't so hard to detect after all. I remembered trying to integrate a download manager(internet download manager) with Google chrome. I actually integrated the download manger with Google chrome after which the browser started to hang. This increased my CPU usage to 100% which affected all functionality of my system. What i did was just ti disintegrate the manager from the browser and my problem was solved instantly.
 When you are face with such issues, just flash back to an earlier time when the system was in optimal condition. It sure would save you a lot of headache.