I have done another Dell Diagnostics and it is reporting the same errors :
' Error Code 0F00 : 0244
Msg Block 6158289 , 289, 290, 293, 294, 295 , 296, 300, 302 etc: Unrecoverable data error or media is write protected '
on various Msg Blocks.
The computer manages to start and seems to be working fine at the moment.
When I had done the hard disk check ' from My Computer ' it had reported clean Drive C.