What is dirty memory?

Dirty memory is the memory, RAM,  is supposed to release back to the system after being used by certain processes, because of not all application designed perfectly.  After a while, more and more dirty memory which supposed to release back to the system for new coming processes build up, so available memory/RAM getting short. This is a reason why You should reboot your computer some time. I reboot mine at least once every two days.

Fresh install of Windows 10 installs home instead of Pro

Have you had a similar problem with the installation Windows 10 Pro below?
“Laptop came with Windows 10 Home pre-installed. I upgraded this to Pro using the Microsoft Store.
When doing a clean install it installs Home without prompting, instead of Pro. Is there a way to force it to install Windows 10 Pro on a clean install?”

Solution: get a copy of DVD Windows 10 Professional 64 bit with embedded Genuine keys from [shop.allogics.com]

How to upgrade from Windows 10 Home if you have a Windows 10 product key.

  1. Select the Start  button, then select Settings  > Update & security  > Activation.
  2. Select Change product key, and then enter the 25-character Windows 10 Pro product key.
  3. Select Next to start the upgrade to Windows 10 Pro.

If you to do fresh Windows 10 professional installation on the new hard drive on pre-install Windows 10 home laptop/desktop. Get this embedded license key Windows 10 professional DVD, by click on the picture below.

  1. Boot from the DVD, and go through straight into self-explain steps.