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Im trying to run virtual machine W7 64 bit maked by my proffesor .Im doing it on my windows xp and the virtual box generate error:

"VT-x/AMD-V hardware acceleration is not available on your system. Your 64-bit guest will fail to detect a 64-bit CPU and will not be able to boot."

Is there any solution?

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VirtualBox 4.3.6 for Windows
My OS : XP sp3
processor 32bit
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edit:
VM log (zipped)
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Minimum information needed for assistance.

what is missing in this post? log and memory size? (my english is not perfect)

Post the VM log (zipped). Details in the previous link.

zipped log added in first post.

The host PC is severely under specified for running a 64bit guest OS.

VBox.log wrote: 00:00:01.121370 Host RAM: 1015MB total, 646MB available
...
00:00:01.668516 RamSize <integer> = 0x0000000040000000 (1 073 741 824, 1 024 MB)
...
00:00:01.669580 VRamSize <integer> = 0x0000000008000000 (134 217 728, 128 MB)

The host doesn't have enough available RAM to run this VM.

Complex file names like "C:\Documents and Settings\dom\Pulpit\chiny\W7-64_Nessus--------------------zzzzzzz-------DWSPiT7122013\W7-64.vdi" are also begging for trouble. Filenames should ideally be something you'd be happy to type.

VBox.log wrote: 00:00:01.670292 HMR3Init: Falling back to raw-mode: VT-x is not available.
...
00:00:03.298149 Full Name: Intel(R) Pentium(R) 4 CPU 2.80GHz

Like it says in the manual: no VT-x or AMD-v, no 64bit VMs.

You might be able to run a 32bit guest such as XP on this host. Say, an XP VM with 256MB or 512MB RAM. Even then however it will not run well because of the single core host CPU (I would regard dual core as the minimum practical spec - hyperthreading doesn't count). This host doesn't have the capability or the RAM to run a 64bit guest.

thank you.