Errors after update to 5.1.10 r112026 (Qt5.6.2)

[PeteyBrown]

Hello,

I am having lots of problems at the moment after updating to 5.1.10 r112026 (Qt5.6.2)

My Host is Win 7 Ultimate 64 bit with 16Gb Memory with AMD Phenom II X6 1090T @ 3.2Ghz CPU
Vbox 5.1.10 r112026 (Qt5.6.2) with Guest Additions and Extension Pack
Guest will be Window 7 Pro 64bit with 8Gb Memory with single CPU
See the Harding Log for info.

The version of VirtualBox I was running before update to 5.1.10 was 5.0.30

I had 2 VM created, one was Linux Mint 17 and the other was Win7 Pro. These worked perfectly for months but after updating yesterday to 5.1.10 I now keep getting the error when trying to start the VM
The error is 5 VERR_INVALID_NAME (-104) - Invalid (malformed) file/path name.

Thinking something had gone wrong I uninstalled 5.1.10 using Revo Uninstaller to do the uninstall and clean the system and then installed 5.0.30 but still getting the same error.
So I then changed the location of the VM onto another hard drive in the system but this to produces the error.
I then deleted the windows 7 VM and copied one the whole master backup folder of the VM and tried again but still the same error.
So I then uninstalled it all again completely and rebooted, then installed 5.1.10 with guest additions and extensions.
Deleted the VM off the system
I then tried to create a new VM, so I clicked NEW and created the VM, then assigned the iso to the CD drive so I could install the OS but as soon as I start the VM I get the error again, so tried a different drive for the VM and again I get the same error.

Nothing I seem to do allows me to create a VM and run it.
Please can someone offer some advice.

[socratis]

The error is 5 VERR_INVALID_NAME (-104) - Invalid (malformed) file/path name.

This is not the complete error, it must refer to what's invalid. Post a screenshot of the error if you have to and if there are error details (like a down arrow that expands the info) make sure to capture that as well...

[PeteyBrown]

Here is 2 screen caps I have merged together.

The first is on the left when starting, then when clicking OK on error it brings the one on the right up

[socratis]

OK, if you can read what's on those screenshots, I need to go to the eye doctor.
Please try again. Do not merge them. Crop them to the dialog size, not the whole screen. 100% size would be the best, unless you're on HiDPI where you should shrink it by 50% for us common mortals.