10.6.3-compatible MacBook won't upgrade w/o re-partition

Intel Core2Duo, 2Gb mem, 215Gb free, File System: Journaled HFS+
Using "MAC OS X V10.6.3 RETAIL" CD:
The upgrade begins with a request to Restart. After the language selection, then "To set up the installation of Snow Leopard, click Continue",then the License Agreement, then "Select the disk..." appears. The disk has a yellow " ! ". Underneath, it says "To install on this disk, open Disk Utility... and repartition this disk using GUID Partition Table. Important: you will loose all data...". I exited the upgrade and ran 'Verify' on the disk: "Volume Nnnnn OK".
I want to avoid repartitioning and "loosing all data", since several of my software install disks were damaged in a fire, and I don't want upgraded versions.
Why won't it just upgrade?
How might I work around this?
Many thanks for any tips or advice!
VI

Repartitioned the MBP HDD using Drive Genius 2 to create a second partition to put SL on (about a 40 gig partition)
Why not shrink and create a new partition with Snow Leopard? Oh, there are changes to the partition tables in Leopard to do that, and there are even more changes in Snow Leopard.
Snow Leopard would need to repair AND prepare a partition before installing.
And, I think there is a new SL compatible version of Drive Genius.
I'm totally in favor of the backup, initialize and reparition, and then install SL on 1st partition, and restore Tiger later on 2nd... after of course doubly insuring that your clone is healthy and works (and you might even want to initialize that external with 10.6.3 DVD as well.
There are/were threads from last Sept about some external cases not mounting or working 100% properly with 10.6.0 too.
I always - since 6.07 and paranoid that I am, and liking to initialize drives with new OS in all cases - go through the backup / format song and dance.

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