The format for pscp is straight forward:
pscp [options] source destination
To copy a Windows file to Linux system, at the DOS prompt, type
pscp c:/music.mp3 ubuntu@10.0.0.3:/home/ubuntu/Music
which will copy the file music.mp3 to my Music folder into Linux. My Ubuntu EVK has an ip address as 10.0.0.3. (Note that you can use either / or \ for the Windows files and directories, but you must use / when specifying the Linux files.)
The reverse works as well (copy Linux file to Windows)
pscp ubuntu@10.0.0.3:/home/ubuntu/Music/music.mp3 c:/
This copies the music.mp3 file from Linux into my C root directory.