Calibre problem to start (database)

[disi]

Hi,

Sorry for this first post with a problem. I tried several times reinstalling now.
Version: Calibre-0.7.23
OS: Windows 7 x64

C:\Users\disi>calibre-debug -g
Starting up...
Traceback (most recent call last):
  File "site-packages\calibre\library\sqlite.py", line 175, in run
OperationalError: unable to open database file
Catastrophic failure initializing GUI, bailing out...
Error in sys.excepthook:

Original exception was:

C:\Users\disi>

Here are the error logs:

First Run (deleted metadata.db):

Corrupted database: Your calibre database appears to be corrupted. Do you want calibre to try and repair it automatically? If you say No, a new empty calibre library will be created.

Traceback (most recent call last):
  File "site-packages\calibre\gui2\main.py", line 205, in initialize_db
  File "site-packages\calibre\library\database2.py", line 151, in __init__
  File "site-packages\calibre\library\database2.py", line 124, in connect
  File "site-packages\calibre\library\database2.py", line 363, in initialize_database
  File "site-packages\calibre\library\sqlite.py", line 211, in run
DatabaseException: table authors already exists
    RemoteTraceback (most recent call last):
      File "site-packages\calibre\library\sqlite.py", line 175, in run
    OperationalError: table authors already exists

After error no repair:
Traceback (most recent call last):
  File "site-packages\calibre\gui2\main.py", line 191, in initialize_db_stage2
  File "site-packages\calibre\library\database2.py", line 151, in __init__
  File "site-packages\calibre\library\database2.py", line 121, in connect
WindowsError: [Error 32] The process cannot access the file because it is being used by another process: u'C:/Users/disi/Calibre Library\\metadata.db'

[disi]

Just checked and it works fine on Gentoo
thx

//edit: great thanks