I was having this issue with Kubuntu Karmic 64 bit host and Windows XP 32 bit guest. I switch to realtime kernel and works awesome. Steps:
1. Install linux-image-rt
2. Install linux-headers-rt
3. Make sure it is set as the default kernel. I did it by checking the grub init screen, and settings its index in /etc/default/grub (GRUN_DEFAULT)
Hopes this helps anyone else, and thanks to qhartman for the tip.
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