Sony CD's, commercial... bought at a store... have "ratchet technology" in many releases.
Modifications happen when you let the CD / DVD install software on your PC. The problem can come out as a bluescreen when you start up (with this as a reference: "Ares sys driver"), or when you disable the Sony software, it can disable your CD Rom drive. It's nasty and has been around for a year or more. More information can be found by goggling "
Sony drm ratchet"
What is it? Ratchet technology exploits the OS and changes it to hide malicious software on your computer by hooking the kernel and altering your registry and actual files like a leech. Essentially it is a big corporate company using the same techniques as hackers!
Download
Ratchet Revealer to see if you have any problems. Some false positives come up, so watch for these bad files identified something- $sys$ -something. They'll be in your sys32 folder. Run the ratchet Revealer to find out.
If you find something google some more to find out how to get rid of it. I was lucky I don't have a problem (other than my persistent cold, cough, cough... maybe I can blame it on Sony :-)
LESSON: be careful saying "yes" when installing software (3rd party software especially when upgrading for "Active X"). This Sony issue is horrific. It's infringement of rights, so be careful when you say yes thinking that it's official. Be on the watch for CD's & DVD's marked "content enhanced" or "content protected." Don't buy it!!!! The fact they are tryig to prevent illegal copying is laudable, but when they infect your system, essentially breaking it, is just illegal and wrong.