Bitlocker

 I have a Inspiron 5579. I was working with Dell support to fix a bios problem. Support had me reset the bios to default and reboot. The PC then asked for my bitlocker key. I never setup bitlocker and had no idea what the key was. The support person had no idea how to fix it. He just said send the PC back. 

Anyway I found the key on the Microsoft site and got the PC booted.

My question is does dell set bitlocker as a default when you reset bios?  

Also I have turned off bitlocker because it will ask me for the key each time I reboot.  Is that safe?