Why my system is not recognizing external devices once i clicked stop installati

[anjanisupriya]

my usb is recogning external devices
during indexing if we once click on stop installation then it is not recognising that device from the next time
pls reply me
its urgent

 

[hang-the-9]

Need more details here, what indexing are you talking about? And why click on stop installation? If it's trying to install something, why not just let it?

Start from the beginning, what is happening, when did it start, messages that come up.