Neil, you could if you are using your own installer routine. However, the installers that exist in the market now either don't have transactional capabilities, are they use their own transaction behaviors (which can't be 100% guaranteed since they are not baked into the driver like TxF (although certain installers come close)).
To use TxF in Vista and Windows Server "Longhorn," it is an explicit model now, as opposed to the implicit model it was before Beta 2 of Vista. So, to leverage TxF, your could will have to change.
Installers though are one of the markets we will be targeting eventually with TxF. So keep your ears open

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