Solution Properties
Solution ID:
200427112207220
Last Modified Date:
Tue Jan 06 12:41:51 UTC 2026
Taxonomy Path:
Case category//I have a problem with...//download/install/activate/upgrade
Author:
[email protected]
ERROR: 'Error 1327: Invalid Drive: [drive letter]' when installing
Description

When you install your Sage software, the following message can appear:

'Error 1327. Invalid Drive: [drive letter]'.

This occurs if your computer has a missing drive. To resolve this, you can create a temporary drive so the installation can complete successfully.

Cause
Resolution

Check you're logged on as an Administrator

If you install without administrator rights, the error can show a different drive letter.

  • Restart the computer, log in as an administrator, and try again

Check if the drive letter exists

  1. Press and hold down the Windows key and press E.
  2. Check if the drive letter in the error message exists:
  • If the drive letter is letter doesn't exist, you must create a temporary drive
  • If the drive letter already exists, don't attempt to create a temporary drive. Check the Windows user and update the system registry

Check the Windows user

Confirm that the Windows logon isn't causing this issue.

  • Create a new Windows user and try installing again

If the error still appears, create a temporary drive for the missing drive letter.

Create a temporary drive

You can create the missing drive by allocating the missing drive letter to a USB flash drive:

  1. Insert the USB removable storage device.
  2. Press and hold down the Windows key and press E.
  3. Check the drive letter allocated to the USB removable storage device.

    The system allocates the next available drive letter to the USB removable storage device.

  • If the system allocates the missing drive letter, you can now install the software
  • If the system allocates any other drive letter, proceed to step 4

  1. Press and hold the Windows key and press R.
  2. In the Open box, type diskmgmt.msc then click OK.
  3. Right-click the USB removable storage device and click Change Drive Letter and Paths.
  4. Click Change and select the Assign the following drive letter option.



  5. From the drop-down list, select the missing drive from the error message. For example, C.

    If the message refers to a different drive letter, choose the relevant letter from the drop-down list.

  6. Click OK and Yes to confirm.
  7. You can now install the Sage software.

    NOTE: Don’t install the software to the new drive you've created.

Once the installation has been successful, the USB flash drive can be removed as normal.

Update system registry

If you're unsure how to complete any of these steps, you must speak to your IT support.

  1. Back up your Registry.
  2. Select Start then click Run.
  3. Type Regedit then click OK.
  4. Browse to the following folder:

    HKEY_CURRENT_USER\Software\Microsoft\Windows| CurrentVersion\ Explorer\User Shell

  5. In the right panel, search for entries that list the incorrect drive.
  6. Modify the incorrect drive to point to C:\.
Steps to duplicate
Related Solutions