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All those 6to4 devices listed in your screenshot are virtual, 6to4 adapter being a component used for transmitting IPv6 packets trough IPv4 network correctly. 6to4 adapters are sometimes created when a new interface comes up and the operating system determines it as a new 6to4 interface. If IPv6 is not deployed, 6to4 adapter will not affect your system at all, so you can safely uninstall it.
To uninstall the component, right-click the item in Device Manager and select "uninstall". If 6to4 adapter(-s) keep being automatically reinstalled, Start -> cmd -> type -> netsh in 6to4 set state disable.