How to Install its software in my laptop?

The ION IED01 electronic drum kit requires the "brains" module to function properly. The module is responsible for converting the signals from the drum pads and cymbals into MIDI data that can be interpreted by a computer or other device. Without the module, the pads and cymbals will not produce any sound or trigger any MIDI data. Unfortunately, it is not possible to bypass the module and connect the USB cable directly to your laptop. You will need to obtain a replacement module in order to use the drum kit.

you can obtain undelet software to do this but do not use the machine too much before attempting the procedure, too much use might lead to the areas where data was stored becoming written over. If the data was very important I would contact a data recovery specialist, one with a proven track record.
Good Luck

What windows are you using?
And what kind of firewire interface?

Well first start by verifying USB port works by plugging in a hard drive or something thus proving you have a good port and USB Cable. At which point hook the keyboard up ( and make sure to properly install drivers provided on cd with purchase) being a pc this may take several attempts to install. What software are you trying to control? Reason? Logic? Fruityloops?

Install the software non the disc or from their website before you plug it in. Try googling drivers for it.

Your machines are different and likely have different interface chipsets. Some newer machines have more built in plug-n-play than others. There is so much incompatibility that it is a wonder that any of the stuff works together. You need to install the needed driver... NOTE: there is a lot of incompatibility between OS versions... so if for instance you are using XP on one machine and Vista or Windows 7 on the other there are a LOT of incompatibilities. ALWAYS check the requirements for the computer with the specs of the device to be connected. MOST of the problems are due to OS variations. Check for driver updates on the Sony site

You should be at SP2, but that MAY NOT be the problem. One thing to check is if you are supposed to have the device connected when you install the software... in SOME cases doing it with or without connection will affect the outcome. Also make sure ALL virus/spyware/popup blockers are disabled during install.

Before using this device, make sure that going to the control panel and looking at the "Sounds and Devices" shows that the Lexicon is the inout and output device for all the tabs within that window.

Here is a link for you:http://www.zoom.co.jp/english/download/software/h4.php Try updating your system software.

If the keyboard is lighting up, there is a 90% chance the problem is in the software in your MAC.

Hint: Software "breaks" easier than the hardware !!!

Re-install your software as a first step.

You have to install software to connect the device to the General MIDI input. This rquires a driver for the 88ES.