In my experience, this has been a bad/defective/scratched disc, a sign of impending hard drive failure, or a CD drive going bad.
I'd try
- Cleaning the disc and re-trying
- Copying the contents of the DVD to the hard drive, and running the install from there. (If you hit the CRC error again during the copy, the cd is bad -- but you might be able to skip the file)
- Running chkdsk on all hard drives -- if you get errors, back the machine up ASAP.
Installation support is also available free of charge.
