lots of problems in cygwin

["ronghua zhang" <rz5b at cs dot virginia dot edu>]

I just downloading the setup.exe(version 2.78.2.3) and run it. after installation, I tried a ls command, but found that the output never linebreak, it just output as one super long line. this really drive me crazy. this is the output when i run 'set'.what's weird is if i run clear, then
run 'set', there is line break. but only the first command after clear. Any other commands have the no line break.

unknown@RONGHUA ~$ set!C:=$'C:\\cygwin\\bin'!D:=$'D:\\program file
s\\FlashGet'!E:=$'E:\\Downloads\\software'BASH=/usr/bin/BASHBASH_VERSINFO=([0]="
2" [1]="05" [2]="0" [3]="6" [4]="release" [5]="i686-pc-cygwin")BASH_VERSION=$'2.
05.0(6)-release'BLASTER=$'A220 I7 D1 H7 P330 T6'CMDLINE=$'bash --login -i'COLUMN
S=80COMSPEC=$'C:\\WINDOWS\\COMMAND.COM'DIRSTACK=()EUID=500GROUPS=()HISTFILE=/.ba
sh_historyHISTFILESIZE=500HISTSIZE=500HOME=/home/unknownHOSTNAME=RONGHUAHOSTTYPE
=i686IFS=$' \t\n'LINES=26MACHTYPE=i686-pc-cygwinMAILCHECK=60MAKE_MODE=unixOLDPWD
=/usr/binOPTERR=1OPTIND=1OSTYPE=cygwinPATH=/usr/local/bin:/usr/bin:/bin:/cygdriv
e/c/WINDOWS:/cygdrive/c/WINDOWS/COMMANDPIPESTATUS=([0]="0")PPID=1PROMPT=$'$p$g'P
S1=$'\\[\\033]0;\\w\\007\n\\033[32m\\]\\u@\\h \\[\\033[33m\\w\\033[0m\\]\n$ 'PS2
=$'> 'PS4=$'+ 'PWD=/home/unknownSHELL=/bin/shSHELLOPTS=braceexpand:hashall:histe
xpand:monitor:history:interactive-comments:emacsSHLVL=1TEMP=/cygdrive/c/WINDOWS/
TEMPTERM=cygwinUID=500USER=unknownWINBOOTDIR=$'C:\\WINDOWS'WINDIR=$'C:\\WINDOWS'
_=seti=$'/etc/profile.d/*.sh'unknown@RONGHUA ~$


What's worse, im vi when i insert some text, the display is just a mess, and if i use h/j/k/l or arrow key to move cursor, it will print out a digit at the cursor's position. here is the screen of vi. I just try to input "this is line one" "this is line two" "this is line three". What is going on!!!!

this6is1lien4one1,17          All
this6is2line2tow716          All
this6is3lien4three2019          All
4,0-1         All
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~                                                              -- INSERT --    2
,1           All