stuck and need unstuck (git checkout)

I was on a branch (local tracked with remote), and I wanted to checkout 
a remote branch so did:
     $git co myRemoteBranch

and got a message that a lot of jar files were being untracked (files were locked). I had a server running that had some of the jar files locked, so it could not update and untracked them all.

What I want to do now is:
     1. switch branches
     2. delete this locally created branch
     3.  re-check out again so all will be well.

I cannot switch branches because it says my untracked files will be overwritten. How do I switch branches? I have no commits to make and simply want to go back. git reset and git stash do not get me there.

thanks

J.V.