You've got error while IE 7 opening to Run Once page http://runonce.msn.com/runonce2.aspx
Resolution:
Edit this following registry:
HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main\RunOnceHasShown
HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main\RunOnceComplete
changed their value to "1".
or created them both if you couldn't find it (Right click where they should be, new DWORD) and changed their value to "1".