请问有关SQL Server的问题，我无法附加数据库.....

在我的计算机上设置新窗口并安装SQL Server之后，我尝试附加旧数据库.但是，我发现我无法将其附加到SQL Server. 好难过".
浏览时的错误是这样.

之后，我尝试检查数据库的权限(在安全性"选项卡上)，然后得到了此权限...

然后单击确定"，发现用户列表中没有用户，如下图所示.


任何人都可以帮助我吗?
如何修复数据库文件?或
我是否需要重新设置窗口?或
我该怎么办?


谢谢......

After I set up new windows to my computer and installed SQL Server, I try to attach my old databases. But, I found that I cannot attach it to SQL Server. "So sad".
The error while brouwsing is this.

After that I tried to check the permission (at security tab)of the database and I got this ...

then I click "ok" and I found that no user in the list of user as the pic below.


Any body can help me?
How can I fix the database file? or
Do I have to set up windows again? or
How should I do?


Thank you......