virtualbox.org

Two host PC (Windows 7-64bit), the same guest (XP32 sp3) works perfectly on the first one and not on the other.
I use the same VDI file, on the two hosts.
Thank you in advance.

Here is the log (attached)

The provided log does not show issues, so I assume it is the log of the working VM? If yes, we need the log of the not working one as well.
How do you transfer the VDI file? How do you link it to the VM on both your hosts?
You also say it doesn't work - what doesn't work? What error message do you get?
The output of the following command on both hosts would be useful aswell : Attach the outputs as a zip file.

You need to provide us with more information so we can understand what is going on

"doesn't work on the other" is not useful. We need an accurate description of the problem. What doesn't work? What error messages or other symptoms do you see.

I should say however that copying a VDI to a new VM on a new PC is the equivalent of taking the hard disk out of one PC and putting it in another. A lot of things can do wrong. You need to narrow it down for us. A better idea would have been for you to copy the entire VM, not just one of the components.