Vista - I need help setting up home network so I can share a printer

Oh Boy do I need some help!

I have read through several other threads on these forums and followed many, many sets of instructions, all to no avail.

Here's the deal (sorry, I'm not terribly tech-savvy, but Ill try my best!):

Desktop PC running Windows XP Home, connected to and printing to a Canon PIXMA MX300. Also connects to ADSL2 through a router.

DELL Laptop running Windows Vista Home Premium, can connect to the net wirelessly through the PC's internet service.

Question: Because the laptop can connect to the internet through the PC, does this mean we should be able to share the printer through this 'network', or do I need to set up another home 'network'? I have tried setting up a separate work group many times and I can't get them to talk to each other.

The printer has sharing enabled in the printer properties.

Question: Does the printer need to be somehow added to the network?

If someone could please come to my rescue with some easy, step-by-step instructions, I would be eternally grateful!

I've just answered this same question, check your firewalls to see if they are blocking anything.