(djangoenv) C:\Users\GAGAN\Desktop\area_pro3>python --version Python 3.7.5
20:45 ~ $ mkvirtualenv --python=python3.7.5 djangoenv
The path python3.7.5 (from --python=python3.7.5) does not exist
It's a Linux machine so use the Linux directories:
mkvirtualenv --python=/usr/bin/python3.7.5 djangoenv