Removing yeildmanager cookie

[Rileyt]

Hey does anyone know how I can remove some tracking cookies? I've got a list of ones that avg (Free edition) is showing me it found and I want to make sure I get rid of them.
"C:\Users\Steve\AppData\Roaming\Microsoft\Windows\Cookies\steve@atdmt[2].txt";"Found Tracking cookie.Atdmt";"Moved to Virus Vault"
"C:\Users\Steve\AppData\Roaming\Microsoft\Windows\Cookies\steve@atdmt[2].txt:\atdmt.com.b3e33b5f";"Found Tracking cookie.Atdmt";"Moved to Virus Vault"
"C:\Users\Steve\AppData\Roaming\Microsoft\Windows\Cookies\steve@mediaplex[2].txt";"Found Tracking cookie.Mediaplex";"Moved to Virus Vault"
"C:\Users\Steve\AppData\Roaming\Microsoft\Windows\Cookies\steve@mediaplex[2].txt:\mediaplex.com.dc30fb3c";"Found Tracking cookie.Mediaplex";"Moved to Virus Vault"
"C:\Users\Steve\AppData\Roaming\Microsoft\Windows\Cookies\steve@mediaplex[2].txt:\mediaplex.com.f652b123";"Found Tracking cookie.Mediaplex";"Moved to Virus Vault"
"C:\Users\Steve\AppData\Roaming\Mozilla\Firefox\Profiles\o9uek8q9.default\cookies.sqlite";"Found Tracking cookie.Atdmt";"Potentially dangerous object"
"C:\Users\Steve\AppData\Roaming\Mozilla\Firefox\Profiles\o9uek8q9.default\cookies.sqlite:\ad.yieldmanager.com.539b0606";"Found Tracking cookie.Yieldmanager";"Potentially dangerous object"
"C:\Users\Steve\AppData\Roaming\Mozilla\Firefox\Profiles\o9uek8q9.default\cookies.sqlite:\ad.yieldmanager.com.557bf2b0";"Found Tracking cookie.Yieldmanager";"Potentially dangerous object"
"C:\Users\Steve\AppData\Roaming\Mozilla\Firefox\Profiles\o9uek8q9.default\cookies.sqlite:\ad.yieldmanager.com.830b6f08";"Found Tracking cookie.Yieldmanager";"Potentially dangerous object"
"C:\Users\Steve\AppData\Roaming\Mozilla\Firefox\Profiles\o9uek8q9.default\cookies.sqlite:\ad.yieldmanager.com.b68f2b7b";"Found Tracking cookie.Yieldmanager";"Potentially dangerous object"
"C:\Users\Steve\AppData\Roaming\Mozilla\Firefox\Profiles\o9uek8q9.default\cookies.sqlite:\ad.yieldmanager.com.ff92306";"Found Tracking cookie.Yieldmanager";"Potentially dangerous object"
"C:\Users\Steve\AppData\Roaming\Mozilla\Firefox\Profiles\o9uek8q9.default\cookies.sqlite:\advertising.com.1820df7a";"Found Tracking cookie.Advertising";"Potentially dangerous object"
"C:\Users\Steve\AppData\Roaming\Mozilla\Firefox\Profiles\o9uek8q9.default\cookies.sqlite:\ad.yieldmanager.com.8a47878";"Found Tracking cookie.Yieldmanager";"Potentially dangerous object"
"C:\Users\Steve\AppData\Roaming\Mozilla\Firefox\Profiles\o9uek8q9.default\cookies.sqlite:\advertising.com.203aa218";"Found Tracking cookie.Advertising";"Potentially dangerous object"
"C:\Users\Steve\AppData\Roaming\Mozilla\Firefox\Profiles\o9uek8q9.default\cookies.sqlite:\advertising.com.b624fa46";"Found Tracking cookie.Advertising";"Potentially dangerous object"
"C:\Users\Steve\AppData\Roaming\Mozilla\Firefox\Profiles\o9uek8q9.default\cookies.sqlite:\advertising.com.f62113d5";"Found Tracking cookie.Advertising";"Potentially dangerous object"
"C:\Users\Steve\AppData\Roaming\Mozilla\Firefox\Profiles\o9uek8q9.default\cookies.sqlite:\atdmt.com.b3e33b5f";"Found Tracking cookie.Atdmt";"Potentially dangerous object"
"C:\Users\Steve\AppData\Roaming\Mozilla\Firefox\Profiles\o9uek8q9.default\cookies.sqlite:\casalemedia.com.1773afc";"Found Tracking cookie.Casalemedia";"Potentially dangerous object"
"C:\Users\Steve\AppData\Roaming\Mozilla\Firefox\Profiles\o9uek8q9.default\cookies.sqlite:\casalemedia.com.2d37ad26";"Found Tracking cookie.Casalemedia";"Potentially dangerous object"
"C:\Users\Steve\AppData\Roaming\Mozilla\Firefox\Profiles\o9uek8q9.default\cookies.sqlite:\casalemedia.com.350339d4";"Found Tracking cookie.Casalemedia";"Potentially dangerous object"
"C:\Users\Steve\AppData\Roaming\Mozilla\Firefox\Profiles\o9uek8q9.default\cookies.sqlite:\casalemedia.com.650648e8";"Found Tracking cookie.Casalemedia";"Potentially dangerous object"
"C:\Users\Steve\AppData\Roaming\Mozilla\Firefox\Profiles\o9uek8q9.default\cookies.sqlite:\casalemedia.com.80ad4799";"Found Tracking cookie.Casalemedia";"Potentially dangerous object"
"C:\Users\Steve\AppData\Roaming\Mozilla\Firefox\Profiles\o9uek8q9.default\cookies.sqlite:\casalemedia.com.987e6b46";"Found Tracking cookie.Casalemedia";"Potentially dangerous object"
"C:\Users\Steve\AppData\Roaming\Mozilla\Firefox\Profiles\o9uek8q9.default\cookies.sqlite:\casalemedia.com.fb62dd4b";"Found Tracking cookie.Casalemedia";"Potentially dangerous object"
"C:\Users\Steve\AppData\Roaming\Mozilla\Firefox\Profiles\o9uek8q9.default\cookies.sqlite:\doubleclick.net.bf396750";"Found Tracking cookie.Doubleclick";"Potentially dangerous object"
"C:\Users\Steve\AppData\Roaming\Mozilla\Firefox\Profiles\o9uek8q9.default\cookies.sqlite:\m.webtrends.com.b4ca7df0";"Found Tracking cookie.Webtrends";"Potentially dangerous object"

Theres the list that avg gave me. I have it remove them and next time I scan I get pretty much the same list again