What Webbrowser do you use?
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Internet Explorer: Tools>Internet options>(under browsing history) Delete...>Delete all... (this will delete all the history) and then restart IE
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Firefox 3: Tools>Clear Private Data...>mark all the boxes>hit Clear Private Data.
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Google Toolbar then do this:
open the history box and at the right bottom there is a blue link (Clear History) and there you go
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If you are logged in Google ore Gmail then sign in and you will see a list of link find the one named (Web History) and if you have saved history you will see your history, at the left you can click on the Remove Items and then select all the links ore click at the right Clear Intire Web History.
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Does it work...?
:^P