Bluetooth. computer to phone.

Hello,
i used to be able to transfer music from my laptop to my cellphone via bluetooth, but now when i try to send some music, it just says "send failed" on my pc screen. i only was able to get 2 songs on to my phone before this problem occured same problem happened with my last phone.

cuurent phone | samsung slyde (m540)

computer | hp pavilion dv9000.

my last phone | lg shine

any help would be highly appreciated, please note that i know how to pair my phone and computer and i also know how to put my phone in discovery mode, the music i am trying to transfer are all .mp3