If files from the hard drive do not open immediately under Windows, the following reasons may be responsible!
You are on an external data carrier
and the data carrier (hard disk) is in standby mode.
Activating the hard disk causes the delay!
You have installed a rather sluggish virus scanner
that checks the file every time before opening it.
Even if the file is not on an external data carrier, this can greatly slow down hard disk access through system optimization software, virus scanners, register optimization and other tools that actively work in the background.
With new operating systems, these are mostly superfluous and the damage caused is greater than the benefit. Especially from Windows -7 and 8.
Systems with SSD hard disks should be completely avoided!
The free native MS Windows Defender and the firewall, plus an Internet Explorer, Chrome or FireFox, which is up to date, are completely sufficient.