iStart Websearches is a browser hijacker (called as Potentially Unwanted Program).
To remove iStart websearches:
1.Go to**Start > Control Panel > Programs & Features>Looks foristart**(or unfamiliar) programs**, right click**& uninstall(follow a prompts).
2 .Open Internet Explorer, click Tools or Settings icon > Manage Add-ons >Locate foristart(or unfamiliar)items in Toolbars & Extensions > choose & remove it.
3. Open Internet Explorer, click Tools or Settingsicon**> Internet options >clickAdvanced** tab and click reset****to reset IE settings to default.
4. To remove remnants of adware in PC, install Malwarebytes Anti-malware (free version) http://www.malwarebytes.org/products/malwarebytes\_free/ and install, update and run the free version – just go with default options in the prompts. If malware blocks/ prevent you to install malwarebytes, rename the malwarebytes installation file to somethingelse.exe or something similar. Once installed, do a quick scan, it'll detect all known viruses & remnants of adware (reboot, if prompts).
Additional reference http://malwaretips.com/blogs/istart-webssearches-com-removal/
//Dinesh