Hello mate! This is my firs post/answer in this forum, I have a question my self, but I see you need help, so it can wait a bit!

Right, can you go on to device manager for me, please? To access the device manager:

1) Windows XP: Click Start, click Run, and then type "devmgmt.msc" (without the quotation marks)

2) Windows 7: Click start and just type in search "device manager" (without the quotation marks)

3) Windows 8: press Windows button and letter X together and from that menu select device manager.

When you are in device manager have a look if you can find your walkman... Tell me if your walkman appears under the "portable devices" section, if yes, then is it with ! mark or ? mark, or none? If your walkman does not appear under that section, is there any device under any subsections which is not recognized (shown with ? mark), or not functioning properly (shown with ! mark), if so, can you write for me the name of that device?

Please provide me with information of what operationg system you are runing? Thank you!