My Uncle is having an issue with his machine.  Some how Bitlocker got turned on, he doesn't remember turning it on.  He now receives a Bitlocker screen when he turns on his machine.  I believe something happened because he also told me it was prompting him for a Service Tag.  I believe he put in the wrong one and could that be causing the Bitlocker issue?  If so, how do we get the proper Service Tag back in?  Any other suggestions?

Thanks