Help with file sharing

Hello folks:

I've got a small home network that I just can't get file sharing working. I
have verizon dsl, a Linksys WRT54G router that's wired to a Vista desktop
and a win98 desktop; and a Vista notebook and WinXP notebook connecting
through wireless. All can connect to the internet without problem.
Vista=home premium.

I'm trying to share one drive of each computer. I can read and write to the
shared drive on the old win98 machine. On the XP machine, I can see all the
folders and subfolders and apparently read them, but not change anything.
On the two Vista machines, it looks like I can completely share the public
folders, but as far as the E drive I'm trying to share, I can only see the
drive itself. When I doubleclick on the drive I get the standard: "\E is
not accessible. You might not have permission..."

I have shared the root of the drives, and given "everyone" share permissions
of full control. I have tried this with windows firewall on and off. All
computers are on the same workgroup.

Both Vista machines have:
network discovery on, file sharing on
public folder sharing on so anyone with network access can open, change, and
create files
printer sharing on
password protected sharing Off
Media sharing Off

So...what am I doing wrong? It just can't be this hard....

Thanks in advance,
Glenn