ANSWERS: 1
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<h4 class="dechead">On One Hand: Must Have Service Pack 1 to Upgrade
For both Windows Vista and Windows XP, you must have Service Pack 1 (SP1) or Service Pack 1a (SP1a) to upgrade to Service Pack 2 (SP2). Microsoft recommends installing both Service Packs for each operating system, and the installations must be done in order.
On the Other: Windows XP Service Pack 3 Upgrade Is Different
In order to upgrade to Windows XP Service Pack 3 (SP3), you only need to have SP1a or SP2 installed. Both are not necessary in this case.
Bottom Line
You can't upgrade to Service Pack 2 on Windows Vista or on Windows XP without first installing Service Pack 1 or Service Pack 1a.
Source:
Microsoft Quick Start: Service Packs
Microsoft: Learn How to Install Windows Vista Service Pack 2 (SP2)
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