Just a thought. I noticed :

Install 'DBD-DB2' version 0.75 in ActivePerl 630.
[download]

I am using ActiveState build 626 on this current machine. I believe the 63X builds have a diffrent Repository because they are not binary-compatible with the 62X series. Don't quote me on that, but i believe it is the case. this would explain why the 63X build does not yet have a PPM for DBD::mysql, and the 62X version does.
If this is the case, and i am sure a kindly monk will confirm/deny, then your next option is to compile it yuorself. From the sound of you original post, i am not sure how easy that will be on Windows ... not to say anything bad, i had been programming perl for a year and a half before i managed to get my first Window module to compile :/

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