Do you want to access Linux drives from Windows, or Windows drives from Linux?
The PC where to access the files from is the "server". The PC that does the accessing is the "client". A "resource" (drive, folder, printer, etc.) needs to be "shared" from the server to the client, with appropriate permissions for the account (userid) that will access it.
From Windows (to Linux):
Browse the Network, or use "net use" from the command line.
From Linux (to Windows):
[don't know a specific LXDE GUI, sorry]
from command prompt:
mount.cifs //ip.or.hostname.of.server/path/to/share /path/to/linux/directory/to/mount/to -o user=userid
There are other options to work around possible problems, or to help troubleshooting, but
we I would need more information, first...