1. If you try to go to /admin/index.php does it properly redirect you to /admin/login.php ? Or does it just give you a "cannot be displayed" error?
Or is the page "blank"?
2. Are you using Apache or IIS now? If you're using Apache, what's showing in the Apache error_log file? That file stores all errors that occur when attempting to process the webpages, including any internal rules that may deny processing due to security concerns.
3. "Compatibility Mode" in IE8 is a feature that tells IE8 to pretend it's IE7. There's a button next to the URL that lets you enable that on a per-page basis.
Does it make any difference if you click that?
4. If you use Firefox to access it instead of IE8, does anything different happen?
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