Yahoo Companion – YCHECKH.DLL

YCheckh.dll and YComp.dll are IE browser helper objects that install with Yahoo Companion, a free, personalizable toolbar that allows you to search from anywhere online, access your favorite Yahoo services, and save bookmarks online that can be accessed from any computer. It also notifies you when new mail has arrived in your Yahoo mailbox. It installs as a standalone or as part of Yahoo Messenger. If you want these services, then you'll need to leave this file in place. If not, you can remove it via WinPatrol or in Control Panel > Add/Remove Programs > Yahoo Companion.
http://companion.yahoo.com/. A tutorial can be found at http://companion.yahoo.com/config/slv4_page?.p=intro&.src=o.

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