If this only happened one time, I wouldn't worry about it. However, if you got this more than once, then there is obviously a problem. It can be anything from a virus/malware to a hardware problem, such as a hard drive. There are Dell diagnostics on the hard drive accessed by F12 at boot up, run a complete diagnostic and see if anything shows up as a starter.
HERE is the Microsoft tech article on the various 7B errors.
I have a bank of 5 external USB connected CD burner drives and depending on how I power them on, I've got that error. Fortunately I know what causes it and can take precautions to not turn on all the drives at one time.
Dell forum member since 2002
Dell Inspiron 15 - 5577 Laptop
Home Built Desktop PC with ASUS ROG Z170, i7 6700K CPU
Windows 10 64 bit Pro and Windows 10 Insider Program Beta Versions. SSD drives. Cakewalk by BandLab and Studio One 4.1 Recordng Studio Software.
Dell S2719dgf Monitor
Member of Nashville based R.O.P.E.
I have changed hard drives and boot from CD ROM with Windows XP CD. During the setup the 7b error comes up everytime. Does this system have to have a dell partition on the drive?