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unable to reprogram ez430rf2500

 i have ez430rf2500 kit in college. when TI people conducted a workshop they  dumped demo program.

now,when i tried to dump some other program,the code is compiled with no errors.but when i click debug and download,i get the following dialog box.

 emulator: fatal error.

                    check if hardware is connected.

                    check if drivers are installed.

                    try to restart the computer

                    windows vista doesn't support parallel port.

                     session aborted! 

when i tried to follow the installation steps of the kit,as the kit already has a demo prog,i directly got msp430 uart application in device manager without manually installing hardware.the gui demo program is running whenever i connect the usb to pc.but iar is not recognizing the hardware.

i dididn't even get"found new hardware". but the previously loaded code is working properly whenever i connect it to usb.i'm using windows7. 

is there any way to stop previous program from running to reprogram it?

 some body,plz help. 

 

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