Recovering a hosed system

I have an Inspiron 16, still under factory warranty. As the result of an overly aggressive Ubuntu installation, I haven't been able to recover Windows. I can get into the recovery environment easily enough, but I get stuck at the point where the software needs to do a reset.  I get nothing but an X in a red circle; I'm told that the operation can't be done.  I've approached this sticking point several ways, but none of them have worked. I need a recovery procedure that works from"bare metal".  That necessarily implies redoing the partitioning.

I don't need to preserve anything from my (working) Ubuntu, since I can easily recreate it.