sql server不能启动，请高手指点。

[kyosuke]

本人才接触sql server，头一天都没什么问题，第二天却启动不了了。
日志如下：
2003-01-02 08:26:32.32 kernel Microsoft SQL Server 7.00 - 7.00.623 (Intel X86)
Nov 27 1998 22:20:07
Copyright (c) 1988-1998 Microsoft Corporation
Standard Edition on Windows NT 5.0 (Build 2195: )

2003-01-02 08:26:32.32 kernel Copyright (C) 1988-1997 Microsoft Corporation.
2003-01-02 08:26:32.32 kernel All rights reserved.
2003-01-02 08:26:32.32 kernel Logging SQL Server messages in file 'C:\MSSQL7\log\ERRORLOG'.
2003-01-02 08:26:32.34 kernel initconfig: Number of user connections limited to 32767.
2003-01-02 08:26:32.34 kernel SQL Server is starting at priority class 'normal'(1 CPU detected).
2003-01-02 08:26:32.36 kernel User Mode Scheduler configured for thread processing
2003-01-02 08:26:33.37 server Directory Size: 5347
2003-01-02 08:26:33.38 spid1 Using dynamic lock allocation. [2500] Lock Blocks, [5000] Lock Owner Blocks
2003-01-02 08:26:33.38 kernel Attempting to initialize Distributed Transaction Coordinator.
2003-01-02 08:26:34.44 spid1 Starting up database 'master'.
2003-01-02 08:26:34.44 spid1 Opening file C:\MSSQL7\data\master.mdf.
2003-01-02 08:26:34.48 spid1 Opening file C:\MSSQL7\data\mastlog.ldf.
2003-01-02 08:26:34.63 spid1 Loading SQL Server's Unicode collation.
2003-01-02 08:26:34.65 spid1 Loading SQL Server's non-Unicode sort order and character set.
2003-01-02 08:26:34.84 spid1 Starting up database 'model'.
2003-01-02 08:26:34.84 spid1 Opening file C:\MSSQL7\DATA\model.mdf.
2003-01-02 08:26:34.90 spid1 Opening file c:\mssql7\data\modellog.ldf.
2003-01-02 08:26:34.95 spid1 Bypassing recovery for database 'model' because it is marked SUSPECT.
2003-01-02 08:26:34.97 spid1 Database 'model' cannot be opened. It has been marked SUSPECT by recovery. See the SQL Server errorlog for more information.


这两个文件都存在啊，但是每次启动都会自动停掉。