Eliminating webbrowser control temp files.

I'm trying to navigate using a Webbrowser control without the user knowing where. Everything else is sorted out but using

Code:

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WebBrowser1.Navigate2 lstrURL, navNoHistory + navNoWriteToCache

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I still get the urls visited in the C:\Documents and Settings\Administrator\Local Settings\Temporary Internet Files folder when the application is running.

How can I get rid of these or stop them appearing when the user is browsing? I'm already clearing the cache after leaving each page which works fine.