Hardware for better function?

there is something in hardware that can be done to improve the monitoring of The Dude?

Type PCI network cards to be mounted on the PC that allow a better functioning?

Hub Switch that enables them to its proper functioning and better?

I ask because at present connected with the PC on my network, it happens that some are connected to a specific Switch / Hub I see them quietly, but other PCs connected to other switch / hub belonging to the same network are not.

sharing among printers, folders, these PCs is done without any problem or limitation.

Help me choose ..

Thanks to all in advance

help me!! :frowning:

you have the same problem?