virtualbox.org

Hi,
I have installed VB on my Mac Book Pro and Windows 7 as guest. When I try to launch Windows 7 (from iso file) appear this message:

"Windows failed to started.........(see file attached .png)"

Supporting data:
OS: Mac OS X 10.5.8
Model Name: MacBook Pro
Processor Name: Intel Core 2 Duo (64bit)
Processor Speed​​: 2.4 GHz
Memory: 2 GB (of which 1,35 GB free)

The version of VirtualBox is 4.1.10 for OS X hosts

I tried to uninstalling and reinstalling the program but without success.

Could someone help me?
Thanks

Attached VB file log.zip

You need to run your host in 64-bit mode. Try holding the 6 & 4 keys down when you boot the host.
If that works then search for the proper way to make it permanent.

Read the manual about hosts requirements to start 64 bit guests.

I solved my problem by selecting the version of windows 7 64bit during the installation of O.S. into VM instead of the std proposal.
Thanks