why my pendrive is not opening?

when im inserting the pen drive in my desktop the icon is visible but its not opening.its showing nothing.even i cannot take it out properly.iv to take it out directly. its not visible in My Computer disk drive.but its working properly in my friends computer.iv got Sony micro vault pen drive.but my dad's Kingston pen drive is working properly in the same desktop but not mine. i cannot derive any data n facing problems. iv scanned it n formatted it in my friends computer.iv even tried through device manager but to no avail. what to do? please help.

riya sarkar
February 2011