Hard drive runs at 100% after boot

3 of us at work are having this issue - after booting our machines, the hard drive runs at 100%, effectively locking the system to unuseability. Also, it seems to be no single process, but a number of Windows processes such as:

• Service Host
• Windows Diagnostic Policy Service
• Windows Cryptographic Service
• Windows Update Orchestrator Service
• Microsoft CompatabilityTelemetry
• Windows Power Shell - this used a huge amount, in Task manager it ran up to 34% of the Hard Drive usage alone - the others all ran on between 1-10%.

SuperFetch used to chew up a huge amount as well, and reading on the forums and net, I turned the process off to see if that worked, but it obviously has not.

This issue only occurs after boot. It does not happen if you log in and log out. To get around it, I restart my machine before going home, but if it crashes I basically have to wait around 10 minutes before I can get enough control back to start opening the programs I need. It appears to be very similar to this issue https://answers.microsoft.com/en-us/windows/forum/all/hard-drive-runs-at-100-after-boot-up/9cfeda41-8a49-4eca-b228-41c7bf29c9c3 , but I can't pin mine down to just one program or process. Obviously we would like a solution to the process, but if not, are wondering if installing an SSD would fix this (we have hybrids in our machines at the moment). All machines have the same build, and not everyone with the same build is having these issues.