Bought new Surface 4 spec i5 120gb Feb 16. Various problems manifested themselves including picture breakup and total lockups. Opened Command Prompt (Admin) Did a Scannow which informed corrupt files, so went through all the Dism procedures This revealed service registration missing or corrupt, so did a Recovery. Repeating the above checks after the Recovery install informed Missing Source files. Enough of this I decided a clean install so downloaded the M$ Media ISO. Everything seems to be running perfectly but curiosity got the better of me so again I performed the Scannow and Dism checks and still it reports Missing Source files. Admin Powershell did not recognise the usual procedures for correcting this. Is this due perhaps that "C" Drive is Bitlocker Encrypted? Does anyone else have this same problem?