Help: my computer is not recognizing my mp4 player anymore

[kalaslsl]

Hi, I bought a cheap Yahee mp4 player model: YHM-MP169C4,
the first time I connect it with a USB cable to my computer I had no problem at all, I transfer music to it and was able to listen to it with no problems,
I disconnect it the cable using the ''safely remove hardware option'',
from that time on my computer has not been recognizing my mp4 player,
if I connect it with the mp4 player off a message says:USB device not recognized, I go to My Computer and is not there, I then turn the mp4player on and the message goes away but nothing happens, I go to my computer and it doesn't appear there either, the mp4player only shows that is recharging the battery but I know that the battery being low is not the problem. I then try the installation disk and it says: ''wrong OS or OS version for application'' and when trying to install the driver from the disk it says:''Load library failed.The specified module could not be found''

I'm just confused why it worked perfectly the first time.I want to make clear that I can use the mp4 player to listen to the songs I have in there already but I wanted to transfer more to it from my computer but is not being recognized anymore, can someone help me with this?
Thanks in advance.

[omal]

Try to connect the mp3 a player in another USB port =) behind the system block it is desirable

[kalaslsl]

Thanks for the advice but I've already tried the four USB ports in my laptop and still the same thing.

[omal]

1)please try connect your mp4 player to another computer
2)try connect another usb devise to your pc (if it works throw the link As you mp4 player looks=)
And under more information on it.please

[kalaslsl]

I connect it to my friend's laptop and it did not work, then we tried a different usb cable and still didn't work.
I connect it my cel. and digital camera to my laptop and they work with no problem.
This is the link of how the mp4 player in question looks:
http://www.yahee.com.cn/products_sho...&productid=486