Have you DISABLED the network booting options in your bios? not just in the startup options, but int the Full SETUP options in the BIOS.
You can't go safe mode. Safe mode is something you can only et to when you boot into th pre-installation environment in windows. This error is still occurring insde the pre-operating system environment. I ca help you out later if needs be - I just jumped on quickly and need to get gone again, But I just want yo uto know that help is around. I will get back as soon as I can.