Firewalls and the login method a problem areas. If XP, you have the option to use "Simple File Sharing" or do so by setting permissions for users. Having all the PCs configured the same as far as login and file sharing method helps a lot. If a login with password is required, PCs that do not use such will have no access to those which do. These are just a couple clues but not all the possibilites. Hope it helps some.
I just got a new computer and i wanted to reinstall windows on all other PCs, when i was configuring the network (workgroup), I found that in some PCs i could access the workgroup (and see all the pcs) but not the other computers or assets, and in others I just couldn't access the work group.
All the drivers are installed, the hardware is working, the IPs and subnet mask are OK, and I'm sharing a Internet connection without problems, the computer directly connected to the Internet cant access the workgroup.
Could some could tell what cold be wrong or give a fresh insight on how the fix this issue.