try format your pc, reinstall windows, desactivate the autoupdates, install drivers and installsql (yep the first program that you will install will be mssql)
some version pirated of windows make crash the windows installer
Omg, you just had to restart your computer and then go to Start -> Run -> "net stop mssql" type that without the quote and hit enter. Here you go try to install again, I had the same problem and I did that...