It would be interesting to know what the contents of that batch file were (can you post it?) and where you got it from (can you tell)? I've never seen a batchfile that can create new users.
Why not login into your good old own account and delete all those new users?
I accedently opened a .bat file that gave me 20sec untill my desktop computer would restart(Windows XP). Now when i start up my computer and get to the User screan, it shows heaps of different users, names with random numbers and opening some of the users with next to nothing accessable in each of them. Is there anyway i can get all my old stuff back?