The term 'pipx' is not recognized as the name of a cmdlet
Check your environment variables. python3 -m pipx ensurepath adds the directories to PATH, but they are added in all lowercase for some reason. Fix the directory paths to match the case.
Use can use pip instead :
pip install eth-brownie
then:
git clone https://github.com/eth-brownie/brownie.git cd brownie python3 setup.py install
u r done !!