Note that many websites have their own advertising, unrelated to adware.
eXactSearchBar is an IE toolbar with the usual search features. Advertised by e-mail to mail.com users as a mail.com toolbar.
From their EULA FAQ:
What does the eXact Software do?
eXact offers a number of software products free of charge, including FunGameDownloads and PhotoGizmo, to Internet users in exchange for permission to display our offers, discounts and/or advertisements. In conjunction with the above-mentioned software, eXact's ad supported software products provide users with valuable offers, discounts and/or advertisements.
Open the Control Panel's Add/Remove Programs option. Select 'eXact Search Bar' and click 'Remove'.