如果在Windows Vista或更高版本上，请尝试通过右键单击并说以管理员身份运行"来打开SQL Server Management Studio.正如Mitch提到的那样，这可能只是权限问题.然后尝试附加到数据库.

If on Windows Vista or higher, try opening SQL Server Management Studio by right clicking and saying "Run as Administrator". As Mitch mentioned maybe it is just a permissions issue. Then try attaching to the database.