dropbox startet nicht richtig nach der Neu-Installation unter windows 7 home premium

Bei Installation einer älteren Version 2.10.52 werde ich auf folgendes hingewiesen:

Dropbox konnte nicht gestartet werden.
C:\Users\user1\AppData\Local\Temp\dropbox_errorhfukci.txt

Veilleicht versteht das ja einer.

bn.BUILD_KEY: Dropbox
bn.VERSION: 2.10.52
bn.DROPBOXEXT_VERSION: 24
bn.is_frozen: True
pid: 16944
cwd: u'C:\Users\user1\AppData\Roaming\Dropbox\bin'
real_path=u'C:\Users\user1\AppData\Roaming\Dropbox\bin'
mode=040777 uid=0 gid=0
parent mode=040777 uid=0 gid=0
HOME: None
appdata: u'C:\Users\user1\AppData\Roaming\Dropbox\instance1'
real_path=u'C:\Users\user1\AppData\Roaming\Dropbox\instance1'
mode=040777 uid=0 gid=0
parent mode=040777 uid=0 gid=0
dropbox_path: u'C:\Users\user1\Dropbox'
real_path=u'C:\Users\user1\Dropbox'
mode=040777 uid=0 gid=0
parent mode=040777 uid=0 gid=0
sys_executable: 'C:\Users\user1\AppData\Roaming\Dropbox\bin\Dropbox.exe'
real_path='C:\Users\user1\AppData\Roaming\Dropbox\bin\Dropbox.exe'
mode=0100777 uid=0 gid=0
parent mode=040777 uid=0 gid=0
trace.file: 'C:\Users\user1\AppData\Roaming\Dropbox\bin\Dropbox.exe\dropbox\boot_error.pyc'
real_path='C:\Users\user1\AppData\Roaming\Dropbox\bin\Dropbox.exe\dropbox\boot_error.pyc'
not found
parent not found
TMP: C:\Users\user1\AppData\Local\Temp
TEMP: C:\Users\user1\AppData\Local\Temp
tempdir: u'c:\users\user1\appdata\local\temp'
real_path=u'c:\users\user1\appdata\local\temp'
mode=040777 uid=0 gid=0
parent mode=040777 uid=0 gid=0
Traceback (most recent call last):
File "dropbox\client\main.pyc", line 2443, in main_startup
File "dropbox\client\main.pyc", line 1399, in run
File "dropbox\client\main.pyc", line 1568, in load_config
File "dropbox\client\databases.pyc", line 247, in load_dropbox_config
File "contextlib.pyc", line 24, in exit
File "dropbox\client\databases.pyc", line 158, in new_config_file
WindowsError: [Error 5] Zugriff verweigert