Ah, i have seen that probe many times, especially in cafe's. You trust me, use a USB ejector.
Are you sure your PC is virus and other stuff free. PlEASE CHeck.Last time i got this problem due to a very strange worm or spyware which almost ate my PC .Instant restart when plugged or deplugged any device and it consumed almost all my RAm once i logged on to internet consuming lot of bandwidth.
Also, try eject or safely remove device if your mobile is NOKIA