What to do if the PC on the local network becomes unavailable?

Question

Computer networks

The situation is terribly trivial, but I point-blank do not see a solution. So, there are 3 devices running Windows OS, these are:
- A PC based on Windows 10 1809/17763.195 HE is the source of the problem
- A laptop with the same OS version
- Mircosoft Surface RT with Windows 8.1 RT on board.
The problem is this - a 1 terabyte screw is installed in the PC, which acts as a local file storage. There were shared several folders from this disk. Everything was working great until the day before yesterday. Suddenly, the PC became invisible for the laptop and tablet (in the explorer itself, in the "network" directory, it is not there, but it hangs as a multimedia device,

though it's of no use, you can't go in), as if it was smoked out of the local area, which is not true, because everything revolves within the same network on the same router.
All basic settings are in order. I didn't change anything.
Local workgroup (Standard Workgroup),
LAN type - "Home",
Access with password protection - disabled.
EVERYONE has full access to directories.
I also didn’t change the folder access settings, and there’s really nothing to change there.
There were no suspicious actions on the part of the OS. I don't even know where to dig. Haven't come across such a joke yet. Demolish Windows and do everything over again, or is there a less bloody method?
I add:
The PC itself does not see itself on the network, as it were, but it recognizes the tablet and laptop ... but the bastard does not recognize itself.

UPD: I installed the "Computer Browser" service, turned off the firewall, the result is the same.
UPD 2: I tried to manually enter the network address of the PC in the laptop's explorer - it went in, but it does not show it in the network location.
And, in fact, it would be possible to close the question, but in this way I lost access to my printer, which is also connected to the PC via USB and does not have a network input. Therefore, the question is still open :( It is necessary to somehow return the computer to the network in a human way.

Answer 1

If you didn’t do anything the day before yesterday, then maybe the computer sucked in some updates.
For example, some time ago (six months or a year ago) Microsoft blocked the SMBv1 protocol. You can
force it to be enabled.
Look, is the "SMB 1.0/CIFS File Sharing Support" checked or not checked on all computers?
SMBv1 is a potentially dangerous protocol. I do not recommend using it, but it is worth checking whether it is the case or not.

Answer 2

Start the services:
- NetBIOS over TCP/IP Helper
- Workstation
- Server
- Computer Browser
- SSDP Discovery
Stop services:
Windows Firewall
If it worked: 1) Something needed was disabled 2) Firewall is not configured.