Could Not Upload Sqljdbc Driver

Hello;
I failed to connect with my database, it give me the massage as following;

Cannot load the SQL driver. Include it in your classpath


Could anyone tell me why? Thanks



And i am using the Microsoft SQL server 2000, Java 2 runtime enviroment and Microsoft SQL Server 2005 JDBC Driver now.

In the user varible, i set a path for the java run time as "c:Program FilesJavaj2re1.4.2javaws"
and CLASSPATH =.;C:Program FilesMicrosoft SQL Server 2005 JDBC Driversqljdbc_1.1enusqljdbc.jar for the JDBC Driver.

and i also tried
1)
-classpath =.;"C:Program FilesMicrosoft SQL Server 2005 JDBC Driversqljdbc_1.1enusqljdbc.jar"

2)i moved the file of the sqljdbc.jar to a path as c: emp

then i try it again as following;

varible name: -classpath
value: ",;C empsqljdbc.jar"

They are still not work

but it does not work

and my code as following;



public MyTest()
{



//information of our connection
//the url of the database: protocol:subprotocol:subname:computer_name:port:database_name
String strUrl = "jdbc:sqlserver://localhost;user=xx;password=xxxx";



//user name and password
String strUser = "xx";
String strPass = "xxx";



//try to load the driver
try {

Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
}
catch (ClassNotFoundException e) {
System.out.println( "Cannot load the SQL driver. Include it in your classpath.");

System.exit( -1);
}

//a null reference to a Connection object
c = null;

try {
//open a connection to the database
c = DriverManager.getConnection( strUrl);

}
catch (SQLException e) {
System.out.println("Cannot connect to the database. Here is the error:");
e.printStackTrace();
System.exit( -1);
}

//create a statement object to execute sql statements

displayInformation();
}


By the way, how i can delete a system variable?
i set the classpath for the sqljdbc in system variable section, but i want to delete it, but when i click the delete button, it does not has reaction. Do you known i i can solve this problem? Thanks