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JPap
Try logging in with the Username "Administrator" without the quotes, and try your password. If you can log in like that are the Security tabs showing up? Maybe you could make the changes you need that way.
I did find a registry hack [windowsnetworking.com] that turns off the display of the Security tab:
Hive:HKEY_CURRENT_USER
Key:Software\Microsoft\Windows\CurrentVersion\Policies\Explorer
Name:NoSecurityTab
Type:REG_DWORD
Value:1
Make sure you take the proper precautions when working with the Registry (e.g., backups).