Svchost.exe randomly takes up 90-100% of cpu... HELP?

If you notice there should be a few svchost.exe running. They are host programs for windows things. (Microsoft likes simple complexity). While a few of the svchost.eve are necessary for running explorer, others aren't. The problem is I do not know of a way to find out except to test it. Which when it fails so does your computer. From experience though, I've noticed ending the one that takes up a lot of CPU doesn't cause a failure and will reset itself if it is needed. I say just make sure your work is saved, and end that program. You may have to reset explorer.exe (not windows). Just push the Open new program button and type explorer if your desktop goes blank.