[Problem solved] When I try to open jupyter notebook in cmd/power shell I get the following error:
Fatal error in launcher: Unable to create process using '"c:\users\NAME\appdata\local\programs\python\python39\python.exe" "C:\Users\NAME\AppData\Local\Programs\Python\Python39\Scripts\jupyter.exe" notebook': The system cannot find the file specified.
I use the command “jupyter notebook“ and also “py -m jupyter notebook”. After searching about it and reading posts of other people with similar problems to mine, I tried reinstalling jupyter and then python but the problem persists.
I install jupyter with this command: “py -m pip install jupyter”
Also I HAVE python added to PATH and the command was successful in installing libraries such as pandas and matplotlib.
I have also tried to repair python using python installer, both before and after reinstallation. Before the reinstallation it gave an error midway that I unfortunately didn’t copy but it was about not having access to a file called python.llb/ldb or something like that. (I am sorry but I really didn’t pay much attention at the time since I intended to uninstall it) After I installed python again, the repair was successful. But I still get the same error when I try to open Jupiter.
My python version is 3.13 (64 bit) by the way and system is windows 10.
Your Jupyter launcher script is still pointing to an old Python installation that no longer exists\python39\.
Deleting everything in C:\Users\NAME\AppData\Roaming\Python\Python39 (if not needed) and then reinstall Jupyter in your current Python 3.13:
py -m pip install --upgrade pip
py -m pip install --upgrade jupyter
You should find the correct files afterwards in:
C:\Users\NAME\AppData\Local\Programs\Python\Python313\Scripts\
Also verify your PATH is pointing to the right files.