[Resolved] Code that has worked, now doesn't work on some computers.

Hi everyone. I have a strange occurence going on that I need to find an answer for.

I have the following code in my Login page on my web program written in VB .Net 2003.

VB Code:

Dim cn As New SqlClient.SqlConnection()
 
        cn.ConnectionString = "Integrated Security=True;" & _
        "Data Source=202.101.8.227;Initial Catalog=Problem Tracking;" & _
        "user id=;password=;"
        cn.Open()
 
        Dim commSQL As New SqlClient.SqlCommand
        commSQL.CommandTimeout = 500
        commSQL.Connection = cn
 
        Dim datRead As SqlClient.SqlDataReader
 
        commSQL.CommandText = "Select * From Employee_View Where LoginName = '" & _
        txtUserName.Text & "'"
        datRead = commSQL.ExecuteReader
 
        Dim letter As Char
        Dim strCode, st, strPassword, strEncryptedPass As String
        Dim i, charsInFile, Code As Short
 
        strCode = 19
        Code = CShort(strCode)
 
        strEncryptedPass = ""
        strPassword = LCase(Trim(txtPassword.Text))
        charsInFile = strPassword.Length
        st = ""
        For i = 0 To charsInFile - 1
            letter = strPassword.Substring(i, 1)
            st = (Asc(letter) Xor Code)
            strEncryptedPass += Double.Parse(st).ToString("000")
        Next
 
        If datRead.Read() Then
            Dim strSysPass As String = datRead.Item("EncryptPass")
            Dim strLoginName, strPrivilege, strStores As String
 
            If LCase(strSysPass.Trim()) = LCase(strEncryptedPass.Trim()) Then
                strLoginName = datRead.Item("LoginName")
                strPrivilege = datRead.Item("Priveledge")
                If strPrivilege = "Manager" Then
                    datRead.Close()
                    commSQL.CommandText = "Select * From EmpStores_View " & _
                    "Where LoginName = '" & strLoginName.Trim() & "'"
                    datRead = commSQL.ExecuteReader
                    If datRead.Read() Then
                        strStores = datRead.Item("Stores")
                        Response.Cookies("Store").Value = strStores.Trim()
                        Response.Cookies("Store").Expires = Now.AddDays(1)
                    End If
                End If
                Response.Cookies("LoginName").Value = strLoginName.Trim()
                Response.Cookies("LoginName").Expires = Now.AddDays(1)
                Response.Cookies("Privilege").Value = strPrivilege.Trim()
                Response.Cookies("Privilege").Expires = Now.AddDays(1)
                Response.Cookies("EmpID").Value = datRead.Item("EmpID")
                Response.Cookies("EmpID").Expires = Now.AddDays(1)
                Response.Cookies("EmpName").Value = Trim(datRead.Item("Employee"))
                Response.Cookies("EmpName").Expires = Now.AddDays(1)
                Response.Redirect("Menu.aspx")
            Else
                Response.Cookies("LoginName").Value = Nothing
                Response.Cookies("Privilege").Value = Nothing
                Response.Cookies("Store").Value = Nothing
                Response.Cookies("EmpID").Value = Nothing
                Response.Cookies("EmpName").Value = Nothing
                Response.Redirect("LoginErr.aspx")
            End If
        End If
        datRead.Close()
        commSQL.Dispose()
        cn.Close()
        cn.Dispose()

This code has worked fine for months. Now, for some reason I can't figure out, it doens't work.

After the user types in their user name and password and then clicks the Login Button, nothing happens. No error code, no progressbar appears, just absolutely nothing.

On one of the machines where this is happening, I set the Internet Explorer settings back to the default. This did not help.

Anyone have any ideas what is going on here?

Thanks