flight simulator X Deluxe Edition

Hi,
I bought flight simulator X Deluxe Edition a while ago.
I installed it without any problems to my pc but found it a bit of a disappointment with a few things and so uninstalled it.
I have recently tried to reinstall it but I keep getting a cab files corrupted messages.
I cleaned both Dvd`s (both dvd`s are like new) and I even bought a new dvd drive, Still the same messages but once again different cab files that are supposed to be corrupted e.g. it could be cab file 7 on one installation, cab file 8 the next etc.
I the tried to installing it using a virtual drive program, Alcohol 120%.
This time it got almost to the end of the installation, and then the cab file message appeared once again.
Its not always the same cab files so it cant be a damaged disc or discs otherwise it wouldn’t be a random error message but it is always cab files, and it does just the same with the virtual drive too.
Can anyone please help me?

Rob

My PC is a: -


Processor Pentium 4 3.00GHz
Memory 2.00 Gig of Ram
Graphics card Nvidia GeForce 6800 GS
Operating Sys Windows XP Version 2002 Service Pack 3