If for some reason IE7 gets stuck on first load runonce webpage stating some kind of loading or server cache error, fear no more. Open regedit, find key "HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main" and add two DWORD Values in
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Read the complete post at http://dario.blog.viadis.hr/2006/10/internet-explorer-7-final-runonce.html