Quick update today for one of the issues seen during SP1 installation on Windows 7 and 2008 R2 installs. The update will be available on Tuesday.
Released today: http://support.microsoft.com/kb/2533552/en-us?sd=rss&spid=14498
This update does not repair machines in a torn state but prevents the issue from occuring when installed on Windows installations that have not have SP1 installed. Comment here with questions.