so, i understand, its beta 0.3 (like really early and stuff), but is it a lot to be asked, to generate a system restore point by the installer prior to installing your software. i just had to reset everything on my vLited Win Vista Ultimate x86, because after using vize my system couldn't load logonui.dll, because it was missing. and the last restorepoint was 8 hours ago, so i had to sit through 15 minutes of restoring on my core2duo and now had to reinstall kaspersky, because this was the last restorepoint (prior to installing KAV).
I'm lucky that it's running again.
So my suggestions would be, generate a Systemrestorepoint (or at least ask the user to do so) and while being still in beta mode, flash big red letters across the screen, that this is beta, save everything beforehand, know what you do and so on...
i've used xpize, which worked like a charm, therefore i was happy to see something similar for vista and installed without much thinking.
so, advice to all who may try it, do a backup of vista beforehand