Ouch. I got a BSOD at about 70% complete unpacking the file.
Knew I was in "big" trouble at that point. (actually I probably should not have pressed forward w/o coming here for some advice when I saw the "reserved" partition in my laptop with recovery data. . . I wanted a "clean" install and I thought that meant I'd need to wipe that out but I chose the "other" partition). Thought that "recover" partition might save me since it could no longer boot to anything but the launch recovery (one option being to reset drive to factory). But that failed too . . .

("error 41" whatever that is!)
Not throwing in the towell though. Will wipe the slate on the hard drive now for sure and start from scratch (Vista then upgrade).
Appreciate the information and effort behind this thread.