Spyware Trackware.Tracking Cookies!rem keeps popping up on my machine, should i be concerned?

it appears that every time i visit yahoo news my spyware doctor detects spyware called Trackware.Tracking Cookies!rem and after googling it it apears to track my browser history and sends to 3rd party, should i be concerned about what it collects and who it sends it to? many thanks in advance:)
Update: i have mcafee full anti virus/firewall suite which found nothing on the few times i scaned, only spyware doctor found it
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