Error relaunching VirtualBox VM process: 5

[flawless]

When i first installed vitrualbox and installed ubuntu in my windows 10,it works great.But next day when i tried to oped it i get "Error relaunching virtualBox vM process: 5Command line:
'60eaff78-4bdd-042d-2e72-669728efd737-suplib-3rdchild --comment ubuntu --startvm33334b6e-8406-401f-b3ab-0e58f2493dcd --no-startvm-errormsgbox --sup-hardening-log=D:
VirtualBoxVMs\ubuntu\Logs\VBoxHardening.log'(rc=-104)
Please try reinstalling VirtualBox.
where: supR3HardenedWinReSpawn what: 5
VERR_INVALID_NAME(-104) - lnvalid (malformed) file/path name."
i reinstalled the VB , uninstalled the Mcafee,and even closed the windows defender,but iy still cant work.
please someone helps!!
here is the VBoxHardening.log

[flawless]

I am sorry for my bad English...
And my VB is 6.1.16. I tried several versions of VB and it didn't work.

[fth0]

The VirtualBox hardening code is prevented from relaunching the VirtualBoxVM process, but cannot identify the cause. This is often the result of security software installed in the Windows host OS. A well-known example is IBM Trusteer Rapport.