If you installed an upgrade version of Windows 9x, you can normally press F4 to boot your previous version of Windows. This option can be disabled.
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|Restrict access to Control Panel, disable Start Menu items, hide drives, disable DOS, boot keys, Registry editing, taskbar, task manager, and network access, hide desktop icons, apply password protection to Windows, and disable running applications. Secure Internet Explorer, disable individual menu items and individual tabs in the Internet Options dialog, as well as specific settings from each, and more ...|