Intermittent file loss over mac / pc network

Hi I hope someone can help, I have been using my network for over a year with no problems also networked the same for the last 4 years.
I now have files and folders go missing when dragging between computers I have one mac pro and x2 windows computers vista & 7.
The network is set up so I have the windows set up for emails and downloading files - I then transfer to the mac, I work on them and drag them over to the windows vista which runs the rip for my large format printer.
I have a shared folder on each pc which all the computers can read/write.
When i drag files and more often folders from the windows 7 to the mac they will not show on the mac but are sitting in the shared folder. when i drag from the mac to the windows vista I sometimes can't see anything in the shared folder (other times a few things) but I can't add folders or drag files over without them going missing. there is no logic or pattern to what i get so if this make any sense i really could do with the help!
thanks ali

There are several things that I had to do in order to get my Mac to play nicely with my PC network.
1. Turned off IPv6 on my mac
2. Set up an account on my mac with the same User ID and PW as on my PC. (and used that account when signing in to the mac.)
3.Downloaded and installed the Gimp printer drivers on my mac. (My printer is connected to one of my PC's)
4.Designated one of my PC's as the network Browser Master.
Let us know how things work out.

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    Hi I hope someone can help, I have been using my network for over a year with no problems also networked the same for the last 4 years.
    I now have files and folders go missing when dragging between computers I have one mac pro and x2 windows computers vista & 7.
    The network is set up so I have the windows set up for emails and downloading files - I then transfer to the mac, I work on them and drag them over to the windows vista which runs the rip for my large format printer.
    I have a shared folder on each pc which all the computers can read/write.
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