Sharing between Vista Laptop and XP Desktop/Printer

I have similar problem as Linda830 but a bit more basic.
I have a printer on a wireless XPHome Desktop and I want to print from a
Vista Home Basic Laptop.Configuration is as follows;
XPHome desktop wired to Linksys Wireless router
Wireless XPHome desktop with Canon ip4200 printer
Wireless Vista Home Basic laptop

I can see the wireless desktop and printer from the wired desktop
I want to but can't see the wireless desktop and printer from the Vista laptop

All 3 comps have same workgroup name
All 3 comps have internet access via the network

On the Vista laptop all I can see is the private network name and internet

At one point during my setup of the new laptop, I had access to the wireless
desktop and printer and printed out a page. For some reason I can no longer
duplicate the setup.

Right now the ip4200 printer is listed in the laptop's printers from when it
worked but I can no longer use it.
This problem is baffling me. I've been trying everything I can get my hands
on. It's a preloaded laptop so I can't ask Microsoft about it.

Any help would be much appreciated.