PLEASE CAN SOMEONE HELP!

i have a sony handycam dcr-trv265e, i havent got the picture disc that came with it as it has been lost for a while, i have the il;ink cable and a windows 7 pc with windows movie maker on the pc but for some reason the cam corder will not connect to the pc, it says its installing the unkown device but then when i try to find it using windows movie maker it cant???

Would be SO grateful for any help

Many Thanks

Jack