Reduce virtual machine size - error

[Lacayo]

I've an old Asus Eepc laptop with Windows XP operating system.
I've cloned the hard drive with Disk2vhd and created a VM with it.
I would like to reduce the size of the hard disk from 128 gb to 40 gb.
Is this possible?

Step 1. Defragment the disks
Defragment the disks ---> OK.
Step 2:
sdelete.exe -z C: ---> OK.
Step 3:
VBoxManage createhd --filename "/path/New.vdi" --size 400000 --->OK
Step 4:
VBoxManage clonehd "/path/old.vdi" "/path/new.vdi" --existing ---> OK
Step 5:
Run the virtual machine with the new vdi disk. ---> NO OK
System error on start it. BSOD

Some idea?

[scottgus1]

Some idea?

Yes. Tell us what the BSOD error is.

[Lacayo]

Hi again
The error is: UNMOUNTABLE_BOOT_VOLUME

Thanks