Restore laptop from USB drive?

My Lenovo laptop needs to free up 6GB of space before I can factory restore, already uninstalled and deleted every file/program but still needs 2GB space… Is there any way I can use a USB drive? I've already tried every method for clearing space and nothing works

? What kind of drive do you have? Empty the recycle bin. Use the Windows cleandisk utility, click properties. General tab, disk clean up.