Using Bluetooth with your PC is not the most reliable way. Use the USB cable provided with the phone. Even with the cable, Disc2phone doesn't seem to always work. I found it to take a long time to work and sometimes it didn't work at all.
Make sure you have the latest version of Disc2phone, download from:
http://www.sonyericsson.com/cws/support/products/softwaredownloads/w580i?cc=us&lc=en
If you used the CD supplied with your phone to install Disc2phone it's probably out of date.
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