Trouble Installing X3 From Discs

Hi
Having trouble installing X3 from discs.  The forum won't let me upload a screen image of the problem for some reason, so I'll describe as best I can.
During installation a box appears saying:
 
C:\Program Files\Cakewalk\Shared Surfaces\APRO.chm
An error occurred while trying to copy a file:
Data error (cyclic redundancy check)
Click Retry to try again, Ignore to skip this file (not recommended), or Abort to cancel instillation.
 
I clicked 'Retry' and my computer has frozen each time I try this.
I am installing X3 over X2 using the 'Advanced' install, omitting 'Session Drummer 3' and Studio Instrument Suite' as I already have these on my computer.  Is this where I'm going wrong?
Any suggestion would be gratefully accepted.
Thanks in anticipation
Alan 
 
My computer spec is:
Case: Carillon AC1 4U rackmount, with die-cast aluminium front panel and 2mm thick steel sleeve.
PSU: Seasonic S12II Bronze SS520GB 520 Watt with 120mm cooling fan.
Motherboard: Gigabyte GAX58AUD5, featuring Intel X58 + ICH10R chip set, one LGA1366 Socket for Intel Core i7 series processors, six 1.5V DDR3 DIMM sockets supporting up to 24GB of system memory, two PCIe x16, two PCIe x8, two PCIe x1 and one PCI expansion slot, eight SATA 3GB/s connectors, two SATA 6GB/s connectors, two USB 3 ports and up to 10 USB 2 ports, two Firewire 400 ports.
Processor: Intel Core i7 Extreme 980X 3.33GHz six-core CPU with 12MB L3 cache.
Cooling: Noctua NHU9DX CPU cooler with two 90mm fans, two Scythe 80mm rear case fans.
System RAM: three 2GB sticks of OCZ DDR3 1066MHz.
Hard drives: WD Caviar Blue 320GB SATA 3GB/s 7200rpm system drive, Seagate 1TB Barracuda 7200rpm SATA 3GB/s audio drive.
Graphics card: ATI Radeon HD 4350 dual-head 256MB, fanless cooling, and with VGA and DVI-D outputs.
Optical drive: LG GH22NS50 22x SATA DVD-RW.
Installed operating system: Windows 7 Professional 64-bit.
 
 

Hi Guys
Reporting back.  I followed both suggestions.
1st I checked the disc for damage and gave it a clean.
2nd I right-clicked on the installer program and clicked on Run As Administrator.
Pleased to report it worked, fully installed and just updated to X3b.
Many thanks for your help guys.
Alan

I honestly do not know why the read me doc doesn't include that in clearer terms.
 
Anyways - glad to hear you now have all kinds of fun new ways to while away the hours, playing with the shiny new toys.....
 
Bob Bone