Unfortunately too late for me. I got online with a MS tech last night & ended up wiping my system install. I haven't lost data (yet) but now I have to reconfigure & reinstall all my applications & user profiles. I figure the grand total time lost will be a full week, including 2-3 days remaining to get it to a useful state.
I don't know if I should try to install SP1 before or after I get my machine to a useful state again. It was 100% stable & up-to-date right before the failed SP1 attempt. Given that SP1 is *supposed* to be minimal, I'm tempted to install it before migrating my old User Profiles. What a nightmare.