Printer and Network not seen by other computers

We use a HP932c printer as our network printer but no other computers on our network can see it. Everything is set for sharing on Windows 7 and on the other computers which are running XP and Vista. Anyone have a clue why I cannot get the other computers to see the network printer. Also Windows 7's network map doesn't see any of the other computers on our network. When our dual boot computer(Vista/Windows 7) is in Vista mode all is fine but when I boot into Windows 7 it doen't see the other computers and visa versa..

If the printer is physically connected to the 7 machine (as how I understand it, could be wrong), you should install the drivers for XP and Vista to it.

You can right click on the printer itself after going to it in control panel | devices and printers. Choose printer properties. Then sharing. At the bottom will be a box to hit for additional drivers. There is also a sharing tab with a check box to share the printer (or not, depending if it's checked or not) and a place to type a share name for it.

As far as the Win7 network map not seeing other computers on the network:

1) Are they all named exactly the same for Workgroup?
2) Start | in search box type services.msc
Is the computer browser service up and running?

I am having the same problem with my home network after installing win 7 i cannot see the pinter or the win 7 computer from any other computer even though i have shared just about everything.
however win 7 computer sees all the others on the home network, so i'm figuring it must be something to do with windows firewall