more on adb
may need to be rooted, which is fine, that is done in charge mode and usb debugging on
which system version would be helpful, 4.5.629 or 4.5.608
adb basics
download adb-fastboot.zip http://www.mediafire.com/?ic6v5a57ci5acd6
move to it's own folder like c:root
unzip with 7 Zip open a command prompt (start/programs/accessories )
type
cd/ (enter)
cd c:root (enter)
adb pull <path to file on device> <file name for computer>or adb -s [yourdeviceserialnumberhere] pull /system /somedirectoryonyourmachine