problem with files being recreated

Hi,

I don't know if this is the right forum to ask this. 

I have a problem with files that I delete, which keep reappearing after a system reboot. (windows 10)

I've tried multiple times deleting the files, also emptying the trash bin afterwards. No success. They keep reappearing.

I also tried using File Shredder, which overwrites the files, (let's call the folder "files-I-want-to-be-gone" ), so the data shouldn't exist anymore at that particular place in the drive.

My next step was to use Microsoft Process Monitor's Boot Logging, with a filter set to the files in question.

After a reboot the logs contain entries:

Operation: CreateFile

Path:  \\my-company-data\profile_mit$\my-account.V6\.IdeaIC2017.2\system\compile-server\files-I-want-to-be-gone_fd73740c

Desired Access: Read Data/List Directory, Synchronize

Disposition: Open

Options: Directory, Synchronous IO Non-Alert

ShareMode: Read, Write, Delete

Impersonating: <my company>\<my name>

OpenResult: Opened

And at the very top of the process trace in the boot log:

Module: SOPHOS~2.DLL

path: C:\PROGRA~2\Sophos\SOPHOS~1\SOPHOS~2.DLL

description: Sophos Buffer Overrun Protection

version: 10.7.2.49

company: Sophos Limited

timestamp: 20.01.2017 20:12:11

at the second position in the trace it states:

Module: svchost.exe

Path: C:\Windows\System32\svchost.exe

for each file in the folder I want to be gone, there is an entry in this boot log, with SOPHOS~2.DLL at the very top of the trace.

My questions:

what's happening here? 

how can I delete my files, without them being recreated on reboot?

Does sophos recreate those files?