This is a dangerous browser hijacker.  This software will take over your browser and send to you to sites that are affiliates of SiteHistory.  It will tamper with your settings, and also has the capability of recording your keystrokes.  This malware is a danger to you and all of your sensitive information.  Once infected with SiteHistory, your browser will begin to work much more slowly.  Your computer will no longer function as it once did.
It is highly recommended that you rid yourself of this junkware as soon as possible.  It is harmful to your computer and can compromise all other aspects of your security.  Removing this malware is of the utmost importance.  SpyZooka can get rid of this problem quickly and efficiently.  SpyZooka is a trusted leader in the industry.