Use Regedit.exe and search for NoBrowserOptions and remove it.
It is most likely to be here (but not necessarily)
HKEY_CURRENT_USER\Software\Policies\Microsoft\Internet
Explorer\Restrictions
If you are unfamiliar with Regedit, then ensure you know how to
restore your Registry in case of error and it is a good to export any
key before deleting.

Check the startup (Start-Run-MSCONFIG-Startup tab) for any unknown
items if it is reset on reboot.

You might try this snippet from Mike Burgess first if you use SpyBot:
'Did you by chance run SpyBot's Immunize feature?
If so, you can unlock by unchecking the option to "Protect IE Control
Panel" '

...Alan