Win7 64 Guest will not install on Win7 64 Host

[TheOtherPhilC]

Win7 will have support when it is released. So far no one really knows what it will be when released.
Also this happens for a lot of Linux distros while they are in beta. Is it smart for the developers to put a lot of effort into something that might be completely changed before it is released?

I agree with the general philosophy of your statement. However, Win 7 is not in beta. It is "code complete", and the current version is a "Release Candidate". Any changes between now and the retail version will be strictly emergency bug fixes. It is what it is.

As it happens, Win 7 32 installs without a hitch in a VBox. (No graphics issues)

I used Beyond Compare to compare the failing 64 bit install to the successful 32-bit install. At the point of failure it looks like this:

64-bit:
============
00:00:07.559 Guest Log: BIOS: Booting from CD-ROM...
00:00:07.570 Display::handleDisplayResize(): uScreenId = 0, pvVRAM=0000000000000000 w=720 h=400 bpp=0 cbLine=0x0
00:00:07.710 Display::handleDisplayResize(): uScreenId = 0, pvVRAM=0000000008380000 w=1024 h=768 bpp=24 cbLine=0xC00
00:00:12.973 Guest Log: BIOS: int13_diskette: unsupported AH=41
00:00:15.062 VERR_VMX_UNABLE_TO_START_VM: CPU0 instruction error 7
00:00:15.062 VERR_VMX_UNABLE_TO_START_VM: CPU0 exit reason 0
00:00:15.062 !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
00:00:15.062 !!
00:00:15.062 !! Guru Meditation -4005 (VERR_VMX_UNABLE_TO_START_VM)

32-bit:
============
00:00:11.199 Guest Log: BIOS: Booting from CD-ROM...
00:00:11.534 Display::handleDisplayResize(): uScreenId = 0, pvVRAM=0000000008eb0000 w=1024 h=768 bpp=24 cbLine=0xC00
00:00:33.007 Guest Log: BIOS: int13_diskette: unsupported AH=41
00:00:36.589 PIT: mode=2 count=0x2ead (11949) - 99.85 Hz (ch=0)
00:00:44.010 Display::handleDisplayResize(): uScreenId = 0, pvVRAM=0000000008eb0000 w=800 h=600 bpp=32 cbLine=0xC80
00:00:47.469 Display::handleDisplayResize(): uScreenId = 0, pvVRAM=0000000000000000 w=720 h=400 bpp=0 cbLine=0x0
00:00:47.518 Display::handleDisplayResize(): uScreenId = 0, pvVRAM=0000000008eb0000 w=800 h=600 bpp=32 cbLine=0xC80
00:13:21.068 Changing the VM state from 'RUNNING' to 'RESETTING'.

Notice the almost 13 minute break in the log. Windows was doing its thing installing stuff on the boot drive. At least I know the issue is not Windows 7 per se. The problem is specific to 64 bit windows. Most likely dealing with OPenGL support.

[Entegy]

If you think it's a OpenGL problem, have you made sure that your graphics card has the latest drivers for Windows 7? I've successfully installed 7 x64 guests on a 7 x64 host a few times.