I plug the USB from the D888 to my laptop (Toshiba Satelitte with Windows Vista) and nothing happens. The USB button is turned on.

Joshua's answer has nothing to do with your problem.

Click the link below :----http://wikisolutions.blogspot.in/2012/02/get-free-answers.html

The hard drive has probably failed. In spite of it rotating, the head servo and electronics has to work. I would recommend testing the drive in a computer to see if it works. You will likely have to reformat it after if it does work. FIRST look for obvious things in the D888 like cable that is partially off or loose.

check to see if your in monitor mode, seems like yout not

Read through the guideline, n u will be clear by ur self!

Chances are you need a driver in your PC compatible with Vista. There are MANY compatibility problems with Vista and special devices such as the Micro Br.

On reading specs, use of the USB is NOT supported on a MAC or on other than the 32 bit version of Vista. If you happen to have the 64 bit Vista, it won't work. All the other versions of Windows seem to be supported..

SOMETIMES one must install the software BEFORE connecting the USB cable to the unit. SOMETIMES one must install the drivers in SAFE MODE. These things are ridiculous, but some of the quirks of Windows are stupid.

No. From their website...

Note: Samson SoftPre is not compatible with Windows Vista however the C01U, C03U and Q1U are all Plug-and-Play compatible with Windows Vista.

I take it You meant LK-210

http://support.casio.com/information.php?rgn=5&cid=008&pid=114

try this;

1.using different usb inputs on your pc desk top
2.update drivers on both your desk top and laptop
3.using a different usb cable

if it works fine on your friends computer most likely its not the mic