Shared folder not showing in network places?

I have 10 computers in the office .I've got some shared folders that aren't showing up on the computer that they're actually on (if I go into My Network Places) & they're not showing up on my other computer either.
All of the 8 PC shows all the folder except for2 PC where Some show up OK but other folders don't

Is there a way to refresh it all in My Network Places so that all the folders that are shared but not showing up actually show up?

I've tried View, Refresh in My Network Places. I didn't think it would work but gave it a go anyway.
I'm using XP Pro on both machines if this helps

Shared folders may not show up in network places. Those are just links, not a list of actual shares.

If you want to see the shares on a particular machine hit

Start -> Run

And then type in the computer name like

\\pcname

and hit enter. You'll get an explorer window of the PC with all available shares listed. If the folder you are looking for isn't listed, then its not shared.

are you sure they are shared? on one of the PCs go to Start > Run > type \\127.0.0.1

does it show the shares?

My network places populates it's list by connecting to a folder. Go to network places, view entire network and carry on through microsoft network then your workgroup and finally the computer in question. If you access the file from here it will add itself to the list, but it may take more than one connection to it for it to show.

if it is not running go to network places and select add network place
and selec the path and finish

then u will able to see the shared folders