Python Installer: "Error writing to file C:\Python27\pythonw.exe"

Question

I am trying to install Python 2.7 (64 bit) on Windows 10. In the middle of the installation, a window pops up saying:

Error writing to file C:\Python27\pythonw.exe. Verify that you have access to that directory

How can I resolve this issue and install Python?

Answer 1

This error is normally encountered when the installer does not have admin rights for the drive/folder you are installing to. I also noticed that you are installing to drive C:

Here are a couple of things for you to try.

Open the installer program by right-clicking, and then selecting "Run as Administrator".

Depending on how you have your PC set up you may not have permission to install on drive C:

If this is a work computer, talk to your IT department. Otherwise, seriously consider using different drives to keep your OS and your applications separated.

Answer 2

I encountered a similar issue while installing Python 2.7.11 on Windows 7 (64bit). Here is how I solved the error.

1. Note down the path mentioned in the error.

2. Do not close the error message. i.e. Do not press "Retry" or "Cancel", let it be there.

3. Go to the directory mentioned in step-1.

4. Try to create a new folder or text file in this directory.

5. You will get an error message saying "The Disc Structure is Corrupted and Unreadable". This is the real issue which is causing the Python installation to fail.

6. Run Command Prompt as an administrator and enter the command: Chkdsk \f C:

7. Either it will start checking the disc or it will ask you to select if you want to check disc next time you boot-up your machine. Select Yes and restart your machine.

8. A disc check will be performed, which may take 5-10 minutes.

9. Now you can install Python without any issue.