Do you recommend I stop using that Windows 98PC.
if it still works for what you need, I don't see a reason to stop. However, If the hard drive is on the way out you should make sure to store anything you want to keep on a removable drive. With a USB Flash drive Windows 98SE is usually pretty finicky but with aftermarket packs like the
Unofficial Service Pack for 98SE you can get some nifty features that we take for granted in later OS versions.
It is physically on the Home network through a Dlink router but the file sharing does not work.
With Windows98 you can share a folder, but in order for Vista or later to access it, it cannot have a password.
Revisiting the common issue that people bring up (and has been brought up here as well) about Windows 98 Security. There is a point to be made there, however:
it's vulnerable to every computer virus that's come out since about the turn of the millenium.
Pretty much every piece of malware in the wild simply will not run on Windows 98. Windows 98 is not secure, but it is also no longer targeted.