It says kernel driver not installed and asks me to execute "/sbin/vboxconfig" but it aint working. Kernel: 5.13.5
That isn't really enough information but the most common cause for that is you have updated the kernel but not rebooted since. This puts you in a situation where your running kernel is different from your installed kernel. So start with a reboot.
If that doesn't work, you probably need to install virtualbox kernel modules.