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In german version of Windows 7:

Systemsteuerung => Verwaltung => Computerverwaltung => Datenträgerverwaltung

right-Mouseclick on the partition you want to shrink => Volume verkleinern ..

I...

As I know, Lenovo uses only three primary partitions: hidden boot partition, Windows partition and rescue partition. Therefore you have the ability to create a primary partition #4 and within this...

You didn't answer my question - the output of "fdisk -l".

Of course, you can shrink the Windows partition with "gparted" (within Knoppix) and install Grub.

Doesn't offer Lenovo the possibility...

First of all, let us know it there is an empty partition on the laptop.
fdisk -l(lowercase L!)