virtualbox interface not working

[Sakalambo]

Hello
i have problem opening Vbox on windows10
it was working fine 2 days ago but today i tried to open it and there is nothing on the screen although it's working in the task manager background processes (virtualbox interface/manager), i tried older version but still nothing open on my screen
anyone have an idea?

[scottgus1]

Disable any autostart guests. Restart the host so no Virtualbox processes are running.
Go to C:\Users\{you} and move the .Virtualbox folder (note the period starting the folder name) to the desktop.
Start Virtualbox. The guest list will be empty, and all File menu Preferences modifications will be reset. (All the guests are still available, just need to be re-registered.)
In the main Virtualbox window, use the Machine menu Add command. Go to each guest's folder and register the .vbox file. See if the main Virtualbox window remains stable.