xperia play - media transfer problems! help somebody

Hi to all, i have one stupid problem, i cant put on my phone any media.
i have installed se companion and media go on my pc, but media go wont recognize my device.
my steps are simple: connect usb cable to phone, the phone shows media transfer, so after i going to my computer to see my phone next to C: drive, there is nothing.. media go do nothing... no any device detected..
when i try connect my phone's card, I get another stupid thing..
im changing from media transfer to mass storage, in my computer pop up removable device, so on my phone i must connect my card - i done that - i can browse my card from pc, and i do simple step drag my music folder to phones memory card, and its ok copyng, but not whole folder its stops copyng on about half, and phone disconnect my memory card automatically while copy in progress, and its keep doing it all times. i have tryed couple different folders to copy, its same, memory enough on card, i dont know whats wrong in there
plz maybe any one can advice me, cose i have a phone but canot put anything on there..
help peoples, write anything, any solution.
i need new music on my phone...
nothing in se web site nothing in troubleshoot http://forums.se-nse.net/public/styl.../sense/sad.gif those things make me realy sad
I cant even upadate my phone through SE companion.. My pc just freeze when i plug in my xperia play while i hold "Back" key
hope someone will help