The Internet Options Control Panel Extension is the file called inetcpl.cpl and can be found under C:\Windows\System32.
Check to make sure the file exists.
If the file does not exist you can run System File Checker.
To do this go to Start -> Run -> type sfc /scannow -> ok
SFC usually requires your Windows XP CD. Insert it when requested.
SFC should replace the inetcpl.cpl file as it is one of the protected Windows files.
Note that you could also have a restriction in place that prevents the Internet Options icon from displaying in Control Panel.
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