Sorry, couldn't find an option to attach the photo with error message. Yes I had gone into Windows site to upgrade but I couldn't get the tool to download; yet another error message. I don't understand what 'a tpm 2.0 module on the mobile'. Spent over 2 weeks trying to sort this whole mess with Samsung, Microsoft and Avast forum (their software crashed safe mode in the early stages of me trying to fix the original issue & wouldn't complete boot scan in regular mode) I resorted to taking it to professionals in the end and seems my HDD drive may have degraded oveer the 5 years since I've had it so I invested in a SDD drive. I lost photos, favourites and some documents. As usual, the lesson learnt here is back up, back up, back up. My only excuse being that I had forgotten how my external hard drive worked exactly and wasn't sure whether it was backing stuff up properly or not. Anyhoo thanks for trying to help.
