I wanna record a song

Hi all ,
i wanna record a part of a song from my laptop to my laptop too ( playing the song on the laptop then switch on any recording program to record a part of the song , i hope it's clear now ) but after i record when i play the recorded file there is no sound !! even the equlizer not moving up & down !! & i checked the sound nothing made mute or something like that but i got only when i move to Recording option in the volume control of the windows xp i got to things 1- Line in 2- mic , these are the 2 things i found so anyone can hepl me ....
My laptop is Dell inspiron 630m the audio driver is : sigma tel high definition audio codec...

dell insprion 630m specs :
Specs General
Processor Pentium M (Dothan)
Processor number 750
Processor speed 1.86 GHz
Motherboard chipset Intel 915GM chipset
Centrino Yes
Memory/Storage
Amt of RAM 512 MB (max 2048 MB)
Hard drive 40 GB
Card Reader SD, MMC, MS, MS Pro, xD
Optical drive DVD/CDRW combo drive
Connectivity
Ports 4 X USB; FireWire; RJ11 (modem); RJ45 (Ethernet); VGA out; S-video
Bluetooth Yes
Infrared No
Ethernet 10/100
Modem 56K data/fax
Built-in devices 1 x Type II PC Card slot; Memory card reader
Wireless LAN 802.11b, 802.11g
Display
Graphics hardware Intel Graphics Media Accelerator 900
Amt of video RAM 128MB
Diagonal screen size 14.1 inch
LCD technology Active matrix LCD (wide screen)
Screen resolution (max) 1,280 x 800
Multimedia
Remote No
DVD/MP3 without bootup No
TV tuner No
Sound hardware Integrated audio ; Dolby digital audio out
Jacks mic-in, S/PDIF, earphone-out
Software
Operating system Win XP Home
Software included Microsoft Works 7.0; Dell Media Experience

Thanks