as mentioned you can create the recovery media from within the windows thinkvantage software suite.
These discs will enable you to recover the laptop to the factory condition in which you received your laptop.
Alternatively, you can download win 7 iso from notebookreview forum and use the serial number (located in the battery compartment) to activate the OS (the same serial no. would work for both 32 bit or 64 bit OS).
May this year, be the year of 'DO'!
I am a volunteer, and not a paid staff of Lenovo or Microsoft