Unable to start Dropbox

[NYC360]

Hi hoping someone can point me in the right direction as DB support have been unsuccessful so far..
Dropbox unable to start, permissions error. This started after windows 10 did a feature update.
I have tried extended uninstall and reinstall etc.
My DB folder is on an external HD via usb, as has always been. If I reinstall DB and create a new folder on the HD it works until a restart then same error.
.....................

EDIT: I have tried scanning HDs for errors etc, as suggested elsewhere, but these are all fine.

All files and drives are not set as read-only

Also have tried rolling back to an earlier version of DB app, but same error..

Win10 Pro V 22H2

Build 19045.2251

......................
bn.BUILD_KEY: Dropbox
bn.VERSION: 160.4.4703
bn.constants.WINDOWS_SHELL_EXT_VERSION: 56
bn.is_frozen: True
machine_id: 258a85fc-374e-4315-8b35-3de5211dd4f0
pid: 10340
cwd: 'C:\\Program Files (x86)\\Dropbox\\Client'
real_path='C:\\Program Files (x86)\\Dropbox\\Client'
mode=0o40777 uid=0 gid=0
parent mode=0o40777 uid=0 gid=0
HOME: None
appdata: 'C:\\Users\\Carl\\AppData\\Local\\Dropbox\\instance1'
real_path='C:\\Users\\Carl\\AppData\\Local\\Dropbox\\instance1'
mode=0o40777 uid=0 gid=0
parent mode=0o40777 uid=0 gid=0
dropbox_path: 'D:\\Dropbox'
real_path='D:\\Dropbox'
mode=0o40777 uid=0 gid=0
parent mode=0o40777 uid=0 gid=0
sys_executable: 'C:\\Program Files (x86)\\Dropbox\\Client\\Dropbox.exe'
real_path='C:\\Program Files (x86)\\Dropbox\\Client\\Dropbox.exe'
mode=0o100777 uid=0 gid=0
parent mode=0o40777 uid=0 gid=0
trace.__file__: 'C:\\Program Files (x86)\\Dropbox\\Client\\160.4.4703\\python-packages.zip\\dropbox\\client\\ui\\common\\boot_error.pyc'
real_path='C:\\Program Files (x86)\\Dropbox\\Client\\160.4.4703\\python-packages.zip\\dropbox\\client\\ui\\common\\boot_error.pyc'
not found
parent not found
TMP: C:\Users\Carl\AppData\Local\Temp
TEMP: C:\Users\Carl\AppData\Local\Temp
tempdir: 'C:\\Users\\Carl\\AppData\\Local\\Temp'
real_path='C:\\Users\\Carl\\AppData\\Local\\Temp'
mode=0o40777 uid=0 gid=0
parent mode=0o40777 uid=0 gid=0
Traceback (most recent call last):
File "dropbox\client\main.pyc", line 811, in wrapper
File "dropbox\client\main.pyc", line 6432, in finish_dropbox_boot
File "dropbox\client\message_queue.pyc", line 305, in _wrapped
File "dropbox\client\main.pyc", line 5959, in _init_components_for_account
File "dropbox\client\main.pyc", line 5883, in create_sync_engine
File "dropbox\sync_engine_boundary\factory.pyc", line 225, in make_sync_engine
File "dropbox\sync_engine\nucleus\classic_client\sync_engine.pyc", line 244, in __init__
File "dropbox\sync_engine\nucleus\classic_client\modern_client\modern_client.pyc", line 280, in __init__
File "dropbox\sync_engine\nucleus\classic_client\modern_client\base.pyc", line 190, in __init__
File "dropbox\fs_api\lifecycle.pyc", line 192, in __init__
File "dropbox\fs_api\lifecycle.pyc", line 206, in _create_thin_client
File "dropbox\fs_api\fs_api_adapter.pyc", line 50, in __init__
File "desktop\extensions\fs_api\fs_api_python.pyx", line 63, in fs_api_python.FsApiServer.__cinit__
fs_api_python.FsApiError: "Initializing fs api |>> Initializing application filesystem |>> Attempting to create new files directory for ApplicationFilesystem |>> Error making tempdir |>> flushing buffers |>> Unexpected syscall return code: 3221226627 (0xc0000483)"

[Jay]

Hi @NYC360, thanks for bringing this to our attention.

Do you have the ticket ID from when you contacted the support team?

This will help me to assist further!

[NYC360]

Thanks Jay,

 Ticket #19484621

[Megan]

Hey @NYC360, thank you for the ticket number!

I was able to locate it, pass my comments and I saw that an agent has just reached out to you, with further steps. Feel free to follow them, and let me or the agent working on your case know if you have any questions.