Windows 10 support?

[thany]

Can we have some form of Windows 10 support please?

Here's the thing. I just installed Windows 10 x64 TP on VB, using settings slightly adjusted from the default configuration for Windows 8.1 guests. Increased the RAM to 4GB, enabled EFI, gave it 2 CPU's, enabled PAE/NX, disabled the FDD, enabled 2D & 3D acceleration. That's it. Then, I 'inserted' the ISO and installed it. Then the problems started. At the very end of the installation, the guest froze completely. No mouse movement even. I guess the guest wasn't able to signal a restart or something, because I think the installation had finished. So I rebooted the guest myself.

Windows 10 boots up. I log in, and all seems fine. Then, as always, the first thing I do is install the guest additions. So I did. I let it install for a bit, and the screen goes blank. This is normal, presumably to detect some devices. But... It stays blank. Completely. Forever. The guest remained completely responsive. So I thought I'd focus the guest and hit Enter. This should press the finish button in the installer and do a graceful reboot. And so it did.

But then, after the animating boot logo, Windows does start, but again with a completely blank screen. Always.
I tried safe mode, but safe mode is "very unfinished" in Windows 10, making it unusable for further diagnosing.

Any advice/help? Should I wait for the VB team to deal with this?

Finally, some details:
Host:
- Windows 7 x64 SP1 fully up-to-date
- Gigabyte Z87X-OC mainboard (UEFI based, latest stable firmware version installed)
- Intel Core i7-4770K (virtualization options all enabled in the UEFI)
- 16GB RAM
- Samsung 256GB SSD (VMs are on this one as well)
- VirtualBox 4.3.10
- Dual Geforce GTX760 in SLI, 3 FHD monitors, driver 344.75
Guest:
- Windows 10 TP x64 (downloaded today)
- 2 CPU's
- 4GB RAM
- Boot order: harddisk -> CD
- Chipset: PIIX3
- Pointing device: USB Tablet
- Extended features: I/O APIC, EFI
- PAE/NX enabled, VTx/AMD-V enabled, Nested paging enabled
- 128MB video memeory, 1 monitor, 2D & 3D acceleration enabled
- 25GB harddisk, type: AHCI, Host I/O cache disabled, SSD checkbox ticked, attached to SATA port 0
- Audio enabled, driver: Windows DirectSound, controller: Intel HD Audio
- Network has 1 adapter: attached to NAT, adapter: Intel PRO/1000MT
- Serial ports disabled
- USB enabled, EHCI controller enabled, no device filters
- Shared folders: none

[mpack]

I think we have enough Win10-as-guest topics already. And off topic in this forum anyway.

Also, even those with support contracts should not expect Win10 support until it is much closer to being released.