For setting the working directory, you should be using the absolute pathname. Any other time you reference a pathname, it should be relative. In other words, it should be something like:
cd "C:\Midterm\hivvax"
log using output\logfile
use data\datafile
No abbreviations needed when using relative pathnames.
cd "C:\Midterm\hivvax"
log using output\logfile
use data\datafile
No abbreviations needed when using relative pathnames.