Ok, you say you have your Network set up; I'll skip that!
Run XP's File and printer sharing; info below.

Then, in vista's Network and Sharing>Add Network device>Browse to XP's
Printer>Add it.
You say you have the printer's Vista Driver already installed in Vista
computer for it.

[url]http://technet.microsoft.com/en-us/library/bb727037.aspx[/url]

Have a read of the above link re Vista File and Printer Sharing.

Permissions/Share info is there as well.

If using Norton, McAfee, Trend Micro I.S., make sure file and printer
sharing is enabled in THEIR firewall (or LAN allowed, depending on how their
Exceptions are worded in their Firewall)

Also, run the XP’s Home or Small Office Network File and Printer Sharing
Wizard to include Vista in your “New” Network, even if you had an XP Network
set up prior to adding a Vista computer to it(redoing the Wizard seems to
work for XP machines!).

In “My Network Places”: “Set up a Home or Small Office Network”
OR under Accessories > Communications > Network Setup Wizard > Allow File
and Printer Sharing.

--
Mick Murphy - Qld - Australia


"Ken Varn" wrote:
[color=blue]
> I have had an annoying problem with my home PCs that is driving me nuts. I
> cannot solve an issue with trying to access a Windows XP shared printer from
> a Vista Ultimate PC. I have read several articles on this on the web and
> tried a lot of the suggestions, but I am still not getting anywhere with
> this. My User accounts cannot print from Vista to the shared XP printer.
> The printer status shows Error - Printing. I have opened up the security
> permissions on the printer share to include Everyone, Guests, Users,
> Anonymous Users with full access, and I still get this error. My
> Administrator account does not have any problems printing from Vista.
>
> Both computers are on the same workgroup. Both computers have identical
> user accounts with identical passwords and permission sets. The printer is
> an HP C4100. I checked with HP and I have the latest print driver.
>
> I have tried adding the shared printer using both local and shared printer
> settings, but still no luck.
>
> Both computers have all of the latest service packs and updates.
>
> I am at my wits end trying to fix this. Please can someone give me some
> advice on how to get this working.
>
>
>[/color]