clustering is a windows server feature and not windows xp. However, using Microsoft VirtualServer you can on a laptop that is powerful enough set up a virtual 2 node MSCS with a SQL2005 cluster. You will need Windows server operating systems (2003 Enterprise, 2000 advanced, etc) to achieve this. It doesnt sound like you have much experience with clustering
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"Ya can't make an omelette without breaking just a few eggs" 😉