Mike installed a new external DVD drive. The installation program required a reboot. As the system rebooted, Mike got a Blue Screen of Death (BSOD) error before Windows fully rebooted. He shut off the system and disconnected the external DVD drive. What should he try next?

LKGC (Last Known Good Configuration)

Explanation:

Last Known Good Configuration will have saved all the critical data & information from the last time when Mike successfully rebooted his system. So if Mike accesses it he will get the system in same state as it was before he installed hard drive.