when i connect my usb pen DRIVE to my pc it shows 'usb does not recognize' this happend me after i had put it on my friend pc, os is xp, kingston usb pls help meHow old is it?  Does it work on another computer?no, i culdnt connect any other pc, i think i bought it before 1 yearDo you mean you haven't tried it on another computer or it doesn't work on the other computer?ya it doesnt work on anothr pc tooHi

Perhaps your friend's computer wrote something onto your pendrive.

Perhaps a user error, like removing it without GOING through the "Safely REMOVE ..." procedure.

Perhaps your friend has a virus, and after you eventually succeed in reading from the pen-drive you will need to visit the malware removal forum.
Sorry, DOOM and GLOOM are my specialist subjects !!!

Regards
Alan
k fine i  will try , tnxI don't think malware is the PROBLEM here.

anandkpvs, have you been using the Safely Remove Hardware feature?

Also, EXACTLY what happens when you plug it in?Look for a small micro-switch on the drive somewhere...they are there for security reasons...It may also turn out that the drive has "died."  It does happen.  I had a Lexar quit after the two year MARK.  The subject doesn't come up often, but I caution people that if a USB drive is their only backup, they should have a second USB as redundant backup, too.