Just done a CMD repair on DCS again,had done one previous in my troubleshooting attempts using Skatezillas DCS GUI with no luck though thought i would try the File Explorer CMD as suggested here in another post,i also changed API from Steam back to Occulus (was previously OXR)and then disabled OXR through the OXR Toolbag Companion and presto DCS is now launching again,will test with both VR and trackir though seems to be launching without crash message.