Is three os( xp,vista,win 7)is installed in a same machine then harmful to a computer hardware?

You have a Gigabyte motherboard with fairly common integrated parts. The drivers included with Windows 7 and the drivers it downloads should be very easy. If your wireless connection does not work, use an ethernet cable plugged into your computer's ethernet port.

If you cannot access the internet at all, you should still be able to install Win 7, but you might have a bit of trouble with more obscure drivers. The more common drivers should be included on the disc and be automatically installed. Install your hardware first.

Put your entire machine together via the manufacturer's instructions. Hook up all the connections. Double check to make sure everything is plugged in properly.

Start up your computer with the Win & disk in the drive. If it doesn't boot from the CD, you might have to go into your BIOs and select the CD/DVD drive as the first device the computer should try to boot from. Once you've booted into the CD, follow the on screen instructions to do a clean install.

You should be given the option to format your hard drive. Do so. It will wipe the old XP files and you'll basically have a new, clean hard drive to install Win7 on.

Note - Make sure you have backed up anything important on an external storage device - a second hard drive, external hard drive, USB flash drive, or burnt CD/DVD. Let Windows do it's thing. Once completed, you might have to install some drivers off the discs that came with your components.

If you can access the web, go directly to the manufacturer's sites and download the latest Windows 7 drivers. Occasionally, Vista drivers will also work in Win 7. If you cannot access the web still, the included driver discs will work, but make sure to update once you get the internet working.

The exception to this is your video card. Never use the manufacturer's drivers for a video card. Always go to Nvidia or ATI (Nvidia in your case) and download their drivers.

That should be it. Install the rest of your software, and be glad you got to skip from XP directly to Win 7.

Windows 7, compared to previous versions of Windows, does remarkably well finding appropriate drivers during the installation process (assuming you're plugged into the internet during installation). I would shutdown, add the new hardware, and then proceed with the format and Windows installation. There's really no point in getting the hardware working on XP - drivers will be totally different for Windows 7 anyway.

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