Im unable to power on my windows WM with PCI passthrough enabled for my nvidia GTX 750Ti gpu

error as below

Failed to register the device pciPassthru0 for 6:0.0 due to unavailable hardware or software support.

and in the logs is:

2019-03-21T15:25:52.321Z cpu22:2100708)VSCSI: 273: handle 8199(vscsi0:0):Input values: res=0 limit=-2 bw=-1 Shares=1000

2019-03-21T15:25:52.330Z cpu22:2100708)PCIPassthru: 2820: Can't use virtual IOMMU with devices with dependencies sbdf=0000:06:00.0

2019-03-21T15:25:52.332Z cpu22:2100708)VSCSI: 6602: handle 8199(vscsi0:0):Destroying Device for world 2100709 (pendCom 0)

looks like an issue with IOMMU is this somthing that can be fix'ed this is a bit beyond my knowledge .

any help would be greatly appreciated, also this is on a Dell T410 with latest bios

thanks