There is a program on your menu called "terminal" or "konsole", click to start it and then type this command and press enter and then just press enter again when asked for a password and copy and paste its contents here.
You need to have a package called "samba-server" installed and running for your vista machine to see your pclinuxos box.
Open synaptic(it has a reddish icon on your panel),enter root's password when asked and then click "reload" button when the program is up and running, then clicking "mark all upgrades" and finally click "apply" and "apply" again on a pop window that will show.
The above procedure will fully update your system, always update your system first before installing packages.
Now that you have fully updates your system, search for "samba-server" and install the package. YOu will now need to start this program and configure it to expose folders on your linux box over the network.
Now go to pcc(pclinuxos control center, it has an icon on your panel too), then go to system->manage system services and make sure "smb" service is running, set the tick next to it to make it auto start at boot time.
Wait five minutes and check your vista system to see if it sees the linux box, it should, does it?
To add folders to share, go back to pcc main page and then click "network sharing" -> share drives and directories with windows machine and set up your shares there.
First just to make pclinuxos visible to your vista machine, we will start working on sharing files when you are done with this stage.