The Windows 8.1 OS on this replacement XPS8700 lacks a bunch of folders that were on th first XPS8700 I bought, but which had to be replaced because its Bluetooth function was absent (unfix-able by Support).
C:\users\name\ should have a folder AppData (or Application Date) with \Roaming and \Local plus some others under that. They were all missing.
I actually added these three folders and managed to get my E-mail client (Eudora7) working, recovering my address book and mailboxes All of these worked on the first XPD8700.
But I do not know how many other folders or files of Windows 8.1 are missing, so I think the OS needs to be reinstalled. Having spent the better part of my time over 60 days with two malfunctioning PCs, I do not want to start from scratch.
How do I refresh or fix the OS without loosing all the programs, folders and files that are already on this XPS8700??