Use WhoCrashed dump analysis tool, to read, analyze Windows Memory Dump .dmp files in Windows 10/8/7. Free download. Reveals drivers or kernel modules responsible for crashing your computer.

These are safe to delete. Depending on your system, you may also see entries like Previous Windows Installation (s), System Error Memory Dump Files, and Windows Upgrade Log Files.

It also lists 909MB of System Error Memory Dump Files and 909MB of Debug Dump Files (same thing?), plus 3.39GB of Per User Queued Windows Error Reports.