Lots of questions there and others will help I know. Can you access your C drive. Dell often put a restore partition on the disk which in effect reformats and reinstalls the OS. I'll have a look at mine and post back.
Surface Pro (2017) vs Surface Pro 4
20 groundbreaking 3D animation techniques
How to mine Bitcoin on Mac
Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.