1. edit the boot.ini and delete the referance to the first xp. Then delete all folders which will remove the first xp BUT NOT THE FILES AT THE ROOT since these are required to boot your 2nd disk install of xp.
2. swap the position of the drives physically and run a repair install of xp on the first drive. This will make it the bootable drive and correct the registry entries that says its the 2nd drive.
mmm - l'd follow Wanderer's advice for this... as he gives you two options. The first does exactly what you ask; the second makes your instalatin perhaps a little tidier overall (but you have bit more to do...)?
Either way... first copy all data etc off system to optical media and verify copies are readable etc. on the parent system - and ideally at least one other? Safety-first?
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