Permissions Error After Windows 10 Update

[Eges]

Hello,

After Win10 Update I am getting "Couldn't start Dropbox." Error message.

I have tried several thing but I can not solve it.

1. Uninstalled Dropbox and deleted all appdata files.

2. When I try to delete my dropbox main folder ".../User/Dropbox" I am getting an permissinons error even if with administrator privileges. 

3. I've started windows in safe mode and be able to delete Dropbox folder in Users folder.

4. Reinstalled Dropbox and it seems to be working.

5. After a reboot, same issue occures. 

My user have full file permissions and disabled my bitdefender antivirus to test it. 
I'm stuck here =/ 

Here is the error log:

bn.BUILD_KEY: Dropbox
bn.VERSION: 110.4.458
bn.constants.WINDOWS_SHELL_EXT_VERSION: 46
bn.is_frozen: True
machine_id: 88beafa7-8ed1-4ffe-81c5-f5d3e334d1c8
pid: 3668
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\\egesa\\AppData\\Local\\Dropbox\\instance1'
real_path='C:\\Users\\egesa\\AppData\\Local\\Dropbox\\instance1'
mode=0o40777 uid=0 gid=0
parent mode=0o40777 uid=0 gid=0
dropbox_path: 'C:\\Users\\egesa\\Dropbox'
real_path='C:\\Users\\egesa\\Dropbox'
mode=0o40555 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\\110.4.458\\python-packages.zip\\dropbox\\client\\ui\\common\\boot_error.pyc'
real_path='C:\\Program Files (x86)\\Dropbox\\Client\\110.4.458\\python-packages.zip\\dropbox\\client\\ui\\common\\boot_error.pyc'
not found
parent not found
TMP: C:\Users\egesa\AppData\Local\Temp
TEMP: C:\Users\egesa\AppData\Local\Temp
tempdir: 'C:\\Users\\egesa\\AppData\\Local\\Temp'
real_path='C:\\Users\\egesa\\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 808, in wrapper
File "dropbox\client\main.pyc", line 6557, in finish_dropbox_boot
File "dropbox\client\main.pyc", line 6037, in _init_components_for_account
File "dropbox\client\main.pyc", line 5987, in create_sync_engine
File "dropbox\sync_engine_boundary\factory.pyc", line 261, in make_sync_engine
File "dropbox\sync_engine\nucleus\classic_client\sync_engine.pyc", line 333, in __init__
File "dropbox\sync_engine\nucleus\classic_client\modern_client\modern_client.pyc", line 165, in __init__
File "dropbox\sync_engine\nucleus\classic_client\modern_client\base.pyc", line 155, in __init__
File "dropbox\sync_engine\nucleus\classic_client\thin_adapter\in_proc.pyc", line 228, in __init__
File "dropbox\sync_engine\nucleus\classic_client\thin_adapter\in_proc.pyc", line 631, in _init_new_engine_locked
File "dropbox\sync_engine\nucleus\thin_client\client.pyc", line 218, in __init__
File "extensions\nucleus\nucleus_python.pyx", line 88, in nucleus_python.NucleusSyncEngine.__cinit__
nucleus_python.SyncEngineError: "Initializing engine |>> Initializing filesystem |>> NtCreateFile syscall: open_unchecked |>> Permission denied"

[Walter]

Hey @Eges; thanks for posting on our Community!

Could you please perform a clean, advanced reinstall and let me know if you still get the same error when trying to launch our desktop app on your computer? 

Thanks!

[Eges · Accepted solution]

I've tried advance reinstall. Also it doesn't work. Other programs which need access to my user folder, running permissions issues.

My solution is create a new user on windows and migrate everything to this new user. 

To sum up, it is not dropbox's issue, windows just messed up this update (again).

[sekturina]

Why did i find this only after I spent hours searching and reading, trying to solve the issue and doing the exact same thing! If only I found this earlier (or if Dropbox support suggested it) it would save me (and guys in support) a lot of time.

Creating a new Windows admin user and installing Dropbox on that user solved the issue for me. Here's a link: support.microsoft.com/en-us/windows/fix-a-corrupted-user-profile-in-windows 

I would suggest Dropbox support to include it as an advice, like a last option (because I didn't find it anywhere in official Dropbox help).

Current status of my ticket is "This is a complex issue to solve ... It could take several weeks, or longer...", but if suggested as a possible solution it could help others as well.