Try this at the CMD prompt.

i fixed the if not defined error
just use errorlevel


i write it after
set /p "cho1=Option #:"
it fixed the empty enter or invaled directory path

and using if not defined without %% worked too

i have no error with start /w %%d it work fine

I notice you changed it in all three places.

even before changing them there was no errors but all work now fine