I have managed to sort it out, thanks to a previous post. It was a case of making the scsi drivers available via a floppy disk drive (see below)
+Re: XP SP3 Endless rebooting Jul 22, 2008 6:03 PM+
+in response to: skyedog+
+Click to view WoodyZ's profile Champion WoodyZ 5,373 posts since+
+Apr 22, 2004+
+Reply 5. Re: XP SP3 Endless rebooting Jul 22, 2008 6:03 PM+
+in response to: skyedog+
+Download the SCSI Disk Drivers and assign the vmscsi-1.2.0.4.flp to a Floppy via the Settings sheet for the target Virtual Machine. You cannot use a USB Floppy Drive in Fusion at this point in the process.+
+Have a look at: VMware Fusion menu > Help > VMware Fusion Help > Managing Virtual Machines > Configuring a Floppy Device+
Cheers,
Roger