VMware/VirtualBox is freezing when loading a kernel/initrd (linux/windows).

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Home:
On my Xubuntu 12.04 host, I upgrade to Virtualbox 4.2.0, that did not make any difference. VMWare Player 5 on the other hand, works great.

But, on my Windows 7 64bit host different HW, both Virtualbox and VMWare Player is freezing (under the same commands).

At work:
Red Hat Linux Enterprise 6.2 as host and VMWare Player is also freezing.
But Windows 7 64bit with VMWare Player 5 was working as it should...

To recreate this, I can chainload iPXE from pxelinux/or make DHCP hand out undionly.kpxe (does not make any difference).

Write:
dhcp
kernel http://some-http-server/images/pxe/linux/vmlinuz
initrd http://some-http-server/images/pxe/linux/initrd

Sometimes the kernel gets downloaded, sometimes not, can freeze on 8 percent on time, 50 percent the next time.

Is this just me?

I have tried fetching the files from different web servers (ubuntu server running apache2, FreeNAS 7.2 server running lighthttpd?).
I Have also tried Red Hat httpd (apache), same result.

The VirtualMachines has bridged network. Makes no difference when if I use WLAN/cabled network.

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