SQL Server 2008 setup: Error "Restart Computer Failed"

When trying to install SQL Server 2008 I found that it requires me to restart computer even after I did it two times.
It was really bad.


However, there are kind people around!
Especially here:

http://www.sqlcoffee.com/Troubleshooting051.htm

So the reason was in pending after-reboot file copying requested (and never performed)

I believe this might cause some mistakes if you really have pending files, so make sure to reboot first.

Originally posted on blog.turevski.com.