BestSearch is an adware with additional browser hijacker functionality. This spyware changes Internet Explorer default search page and serves undesirable commercial advertisements. BestSearch can be manually installed or may arrive with some ad-supported software.
megainstaller.exe
megahost.dlltemp.dll
HKEY_CURRENT_USERSoftwareMegaHostHKEY_CURRENT_USERSoftwareMicrosoftInternetExplorerMainUseSearchAsst=noHKEY_LOCAL_MACHINESOFTWAREMicrosoftInternetExplorerSearchSearchAssistant=[siteaddress]8BC6346B-FFB0-4435-ACE3-FACA6CD77816HKEY_LOCAL_MACHINESOFTWAREMicrosoftWindowsCurrentVersionUninstallMegaSearch