System Manufacturer/Model Number Asus OS Windows 7 32bit CPU pentium 3.8 ghz Motherboard P5w-DH Deluxe Memory 4gb DDR2 Graphics Card 8800 geforce gt Monitor(s) Displays Dell
PSU Cool Power Gamer Series CP-G880 880W 20+4-pin Blue LED Fan A Case Logisys CS308RD 10-Bay ATX Mid Tower Cooling CNPS9500A LED Hard Drives 500 gb maxtor
The most common cause of that specific error is the installation media.
Where did you obtain the Windows 7 installation DVD ... did you download and burn an image, download an upgrade from Microsoft, or was it bought from a retail store ?
The only way to upgrade from XP to Win 7 is to format the Hard Drive and then install Win 7.