Firstly the laptop and PC need to be on the same workgroup - right click my computer icon>properties>computer name> click change and enter a name for the workgroup e.g. rabbit - do this for both computers then reboot.
Create folders to be shared - right click > properties > sharing>click on 'if you understand the security risks.....
then check just share this folder
Go back in and check share this folder on the network > OK
then drag any files into that folder
A hand will appear under the folder
Go into my computer and click on map network drive > browse > then you can access the other PC's shared folders
Repeat as necessary
Hope this helps