Hi, I believe I did cover that briefly.

Let me ask:

When you are using the BIOS, is Windows loaded?
If Windows is not loaded, what relevance does the system disk have?
If the system disk has no relevance, what relevance has a Windows update?

Put another way, can you still boot to the BIOS with the system disk removed?

That your touchpad does not work when using the BIOS says Windows is not relevant to the problem.

I can't comment on the coincidence.
And doesn't the failure of System Restore also raise a red flag other than faulty hardware?
System Restore is erratic. It can suddenly fail to complete restoring, if that's what you're referring to. When it works, great; but don't rely on it.

The only other thing I can think of is the CMOS battery- but that's no more than a thought.

How do I know my CMOS battery failed?

Here are the CMOS battery failure symptoms:

  • The laptop has difficult booting up
  • There’s a constant beeping noise from the motherboard
  • The date and time have reset
  • Peripherals aren’t responsive or they don’t respond correctly
  • Hardware drivers have disappeared
  • You can’t connect to the internet