ESXI 6.5 Unable to boot.
What's exaclty is the issue? Since you seem to be able to boot into WIndows, it' doesn't seem to be a hardware issue!?
Depending on what's the root cause, there might be different options available. These range from simply reinstalling ESXi (with preserving the existing VMFS datastore), to booting from a rescue CD to extract/download the VMs.
André