WER is the Windows error reporting and problem solving system (eg. WerMgr.exe, WerSvc.exe, WerCplSupport.exe), hence what you see in your network traffic is probably the transmission of error reports to Microsoft.
This should be configurable in the systems Update settings or Maintenance Settings, as final solution you could simply deactivate the service:
- Start Task Manager
- Goto Services Tab
- click Services button (or Open Services, not sure about the exact name)
- look for Windows Error Reporting service, right click it and choose properties
- set start mode/type to "deactivated"
- restart system