Two separate (?) problems - printer and file sharing

I haven't yet found the answers to these problems, so . . . we have
two laptops and two desktops on a wireless home network, one each
Vista and one each XP. I'm trying to establish full sharing amongst
the user community (me and my children) and can't even get the Vista
devices to recognize each other.

The specific problems:

1) The Vista laptop can "see" C:\ on the Vista desktop, but cannot
access it ("access denied"). This despite setting desktop C:\ sharing
to "Share". Where should I go for clues to fix this?
2) The Vista laptop can "see" a Lexmark printer connected to the
Vista desktop, but cannot print to it (a password dialog box comes up,
despite not having password protection enabled on the desktop). Where
should I go for clues to fix this?

I'm semi-dreading fixing these problems, since my next step will be to
get the two XP devices to recognize everything too.

Thanks for whatever help you can give me -

On Aug 6, 11:51 pm, "Robert L [MVP - Networking]"
<nore....RemoveThis@hotmail.com> wrote:
> 1. Enabling share is not good enough. You may need to assign permission in the Security tab.

I have to consider myself a newbie on this. I'm in the Properties tab
for C:\ on the Vista desktop, and when I enter "Chris" (the user of
the Vista laptop) I am told that "Chris" cannot be found. (If the
links you provided answered this question, I couldn't find that
answer.)

> 2. Have you installed printer driver for Vista?

The printer in question does not have a Vista driver - according to
Lexmark, the manufacturer. It prints just fine from the Vista
desktop, certainly without a Vista driver. Is there some other
possible mechanism to remove the password requirement? (If the links
you provided answered this question, I couldn't find that answer
either.)

Thanks . . . . and if Vista's capabilities don't at this point extend
to networking Vista computers together, I can handle not working on
this further.