Default aero theme files?

Basically, I downloaded a new theme about a month ago, and I forgot to backup the original files in C:\Windows\Resources\Themes, and I now can't not use the theme I downloaded. I want to switch back to the default theme, but when I do, everything looks like a spiffed up version of windows classic: the task bar is essentially the same, but lacks colour, aero, and a circle for the start button. I was wondering if anyone could upload the files they have to Mediafile, Rapidshare, etc., or if anyone knew where I could download them. Thank you in advance.