I am not sure what your problem is but see below link how to connect your Lumia to a XP computer.
https://forums.windowscentral.com/e?...token=PzvumeJt Furthermore be careful to remove "other files" they may be needed for the OS.
If the "other files" are on your SD you can also get the SD out your phone and put it in your PC's card reader and try.
If the "other files" are for example dpf open the pdf app and they you can delete them. And for documents you can do the same open office to delete them.