If a user is unable to save the “Run Once” page that comes up after installing IE7 (http://rononce.man.com/runonce3.aspx), there is a manual way of disabling it.

Open regedit, goto [HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main]
Look for the following two keys.
RunOnceHasShown
RunOnceComplete

If the keys aren’t there create both as new DWORD Value and set the value to 1 for each.