InCreasing CPU for service host

I have a big problem .  After opening my computer , my CPU is creased by Service host and still stable...... For this reason my pc's temperature is increasing so rapidly........ So i want to stop this .. When i stop that service host by end task then my pc get shut down. What can i do now to solve this problem???????????????????? My laptop is Dell vostro 3460 and windows is "windows8.1 64bit" ....... My windows is updated too.........