Just make the 4th partition "Extended" type, and then make your logical partitions inside that. So you could have (for example):
sda1 - SYSTEM_DRV
sda2 - Windows7_OS
sda3 - Lenovo_Recovery
sda4 - {Extended}
sda5 "/" aptosid
sda6 swap
sda7 "/home"
BUT -- Use the Windows 7 "disk manager" utility to shrink the Win 7 partition first, NOT Gparted! After you do that, then you can use GParted to make the 4th partition.
EDIT: --- Upppps, sorry Piper!