try these tips this might help -
just try booting your computer under safe mode
update the graphic and windows driver and system drivers
remove any unwanted software and free some space in system
checkout for any virus or tool bar problem for any other help and steps
visit [https://goo.gl/QEn0T0|FIX- Laptop stuck on ” Preparing Automatic Repair ” after system error] and let me know if you have any other issue after this . thanks and welcome