When I wrote out the instructions back in 2009, they were for adjacent operating system releases. Windows 7 is one step beyond, so the first step is to go to the printer manufacturer and see if XP 32-bit and Windows 7 64-bit drivers exist for your model.
If they do, then you follow my original instructions, reading Windows 7 in place of Vista.
If there are not both sets of drivers, it is game over unfortunately..
To share a network printer being hosted by a computer running a 32 bit operating system with another computer running a 32 bit operating system, Vista or XP, you would go to Control Panel > ‘Printers’ > ‘Add Printer’ > ‘Add a network printer’. Apologies if you consider that I am stating the obvious.
Sharing a printer being hosted by a computer running 32 bit Vista or XP with a computer running 64 bit Vista is not obvious, because if you use the above method, it will not work.
So how? First, you need to know the name of the computer which hosts the printer, and the name of the printer to be shared.
Sitting at the host computer: The procedure is the same for Vista and XP
Start > My Computer > Properties > Computer Name tab > Change button. Write down the name that you see here because this is the computer name.
Start > Settings > Printers and Faxes > Right click on the printer to be shared > Properties > Sharing tab. Write down the name that you see here because this is the printer name.
OK. Now sit in front of the Vista 64 computer:
Start > Control Panel > Printers > Add printer > Add a local printer > Click on ‘Create a new port’ > ‘Local Port’ > ‘Next’.
The port name will look like this: \Computer name\printer name
So enter the names already retrieved, ensuring that you use the same format, then click ‘OK’.
At this point, you will be presented with the ‘Add New Hardware’ process. You can either select the make and model of your printer from the lists or insert your printer installation disk if you can’t find yours. The printer will be added, and you should be able to print a test page.