<PACKAGE>.exe /VERYSILENT /DIR=<PACKAGEPATH> /Extract=”YES”
Silent switches to install the driver can be found in a xml which can be retrieved by replacing the .exe of the driver url with _2_.xml
eg:
http://download.lenovo.com/ibmdl/pub/pc/pccbbs/thinkcentre_drivers/c1chp13us17.exe
http://download.lenovo.com/ibmdl/pub/pc/pccbbs/thinkcentre_drivers/c1chp13us17_2_.xml
Thanks, it really helped me !