i'm having trouble connecting android phone to PC. i used to work fine a month ago,like android debugging mode in notification bar & i had to choose from the options like charge only etc. on phone& on PC like normal USB devices auto play option appeared.
but now all of sudden it has stopped working.firstly,a pop-up USB NOT RECOGNIZED used to show up.then i tried going to device manager,uninstall and check for updates. no luck yet! and it doesnot appear in usb devices in device manager any more

P.S: i'm using windows 7 ultimate
this is my first ever question here,will appreciate any help..thanks in advance
