Virtual Machine windows "Frozen"

[mcoa]

Hello,
I'm using proxmox 2.3 for virtualize my infraestructure in this moment i have 9 virtual machine (7 windows and 2 linux). This virtual machines were migrated from xen server using "qemu-img" Example: qemu-img convert -p -O raw XenDiskVirtualMachine.img /dev/VM_STORE/vm-101-disk-1 , when the "vm-101-disk-1" is my lvm disk (i created the vm previously).
But I have problem with the virtual machine (windows) this vm in some time are "frozen" and the solution is force reboot. I search problem in the proxmox log but i dont have any "error" . The hardware configuration for this machine are the next: Memory 1 GB, Processors 1, Hard Disk Ide and cache writeback, Network rtl8139. The options are default, use tablet for pointer yes, acpi support Yes, scsi controler type default (lsi), kvm hardware virtualization yes, cpu units 1000, freeze CPU at startup No, etc.
The hardware for physical machine is 16 CPU and 32 GB ram. The proxmox information

root@node1:/var/log# uname -a
Linux node1 2.6.32-18-pve #1 SMP Mon Jan 21 12:09:05 CET 2013 x86_64 GNU/Linux

root@node1:/var/log# pveversion -v
pve-manager: 2.3-12 (pve-manager/2.3/ad9c5c05)
running kernel: 2.6.32-18-pve
proxmox-ve-2.6.32: 2.3-88
pve-kernel-2.6.32-18-pve: 2.6.32-88
lvm2: 2.02.95-1pve2
clvm: 2.02.95-1pve2
corosync-pve: 1.4.4-4
openais-pve: 1.1.4-2
libqb: 0.10.1-2
redhat-cluster-pve: 3.1.93-2
resource-agents-pve: 3.9.2-3
fence-agents-pve: 3.1.9-1
pve-cluster: 1.0-36
qemu-server: 2.3-17
pve-firmware: 1.0-21
libpve-common-perl: 1.0-48
libpve-access-control: 1.0-26
libpve-storage-perl: 2.3-6
vncterm: 1.0-3
vzctl: 4.0-1pve2
vzprocps: 2.0.11-2
vzquota: 3.1-1
pve-qemu-kvm: 1.4-6
ksm-control-daemon: 1.1-1

¿Any suggestion for this problem? I attach screenshot for configuration .


Thanks.