Total Confuddlement - Corrupted Back Ups

[Naph]

Here it goes...
I've backed up all my CD's in the past onto my computer. (These are all iso's and some mdf etc) and now suddenly after a format, they all have somehow corrupted. All the errors are the same though; either a file does not match that of the .dat or the setup. (using Daemon tools.)

Here's the catch...
When I burn them to a CD, they work... Completely!

Is it a Hard Drive error? How can I prove this?

Specs are:
8800GT, Dual core 4400+, 2gb ram, 200Gb & 80Gb HDD.

 

[Avoidist]

Is it a Hard Drive error? How can I prove this?

Insert the CDs into another computer if one is available.

 

[Naph]

Insert the CDs into another computer if one is available.

Hmm, that's an idea.
I'll copy over Oblivion, see how I go.

 

[Naph]

Apparently it was my 80gb HDD, and now the computer won't start because it develops an error while trying to load the OS.

I'm not prepared to lose all I own...

*Currently posting on my Wii™*

 

[Naph]

HAH Nailed it!

My wattage is too small after getting the 8800!
When I get a new power supply, and all my backups should work ;D