The main problem is why only 2 PCs can't access the network, yet others can.
COM16 can freely access any pc.
COM16 is sharing drive D, drive F, and 1 folder.
COM11 able to access COM16 only folders, not the drives.
COM17 and ADMIN-PC totally not able to access com16
IP access also failed.
All PCs belong to the workgroup WORKGROUP. No known IP conflicts exist.
All settings shown are from COM17 and are exactly the same as COM16
LAN Network Settings:
Disk Sharing Settings:
Using Ip in Explorer: