error opening zotero

I try to open zotero stand alone (windows 7) and there is this error message:
Database upgrade error
[Exception... "Component returned failure code: 0x80630001 (NS_ERROR_STORAGE_BUSY) [mozIStorageConnection.executeSimpleSQL]" nsresult: "0x80630001 (NS_ERROR_STORAGE_BUSY)" location: "JS frame :: chrome://zotero/content/xpcom/db.js :: Zotero.DBConnection.prototype.query :: line 149" data: no] [QUERY: DELETE FROM itemTypesCombined] [ERROR: database is locked]
Any ideas how to solve it? Many thanks!!
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