Never thought of XP compatibility mode - I'll be sure to tell him that.
I did see a colour profile in the settings and I saw two - Windows and Adobe. I do remember changing it but I can't remember if I actually restarted to see if it worked.
Next time I head to his place or whenever we'll see if there's any preferences we haven't deleted. I'll probably just search the whole C drive it.
Thanks dudes. Replies still appreciated.