Follow These Steps:
1. GO TO DESKTOP -> My computer-(right click on) -> Properties -> Adavnce system settings
2. Go to HARDWARE tab -> Device manager -> now you will see a window of Device manager
then go to Ports -> Communication Port(double click on it and Open).
3.Now you can see a Communication Port properties.
go the Port Setting:----
and now increase ur "Bits per second" to 128000.
and "Flow control" change 2 Hardware and enjoy!