I've heard that it's not necessary nor a good idea to use third party file maintenance tools, such as System Mechanic, in Windows 10. I've also heard that internet security tools, such as Norton Security, aren't necessary either. Is this true? I understand that Disk Cleanup can be scheduled and won't run during times of active computer use, which wasn't the case in earlier Windows versions. It appears that Windows Defender has also been improved, but can it perform all of the security functions of Norton? With improved disk speeds, file fragmentation isn't as much of a problem as in the past, but is it really not a good idea to use an all-in-one file maintenance tool in Windows 10? Thanks for any advice.