Posted 18 December 2009 - 10:55 AM
Make sure they are all in the same workgroup, don't use Win7's homegroup thing. Turn off any and all firewalls running on any PC. Get the IP addresses of each PC, see if you can ping each PC from the other 2 PCs and vice- versa. Some people have to turn on the guest account some don't, that is trial and error. I'd try it without then turn them on and see if it works.
I am not going to repeat what you can easily find on the net with Google. If you are unsure how to enable file sharing in each OS, Google it. There are hundreds of pages on each OS.
Hope this helps
Associate in Applied Science - Network Systems Management - Trident Technical College