Flex inside Flash? [AS3]

Perhaps I’m doing something wrong, but i’m having some issues loading Flex applications into an SWF based site design. I’m using the correct Syntax, I know this. I’m using this code:

var ldr:Loader = new Loader();
var url:String = “albums.swf”;
var urlReq:URLRequest = new URLRequest(url);
ldr.load(urlReq);
content_mc.content_page2_mc.disc_mc.addChild(ldr);

^ yes, laugh at the last line if you want. But that’s not the issue.
The problem is, I receive a security error upon execution.

Error #2044: Unhandled SecurityErrorEvent:. text=Error #2140: Security sandbox violation: file:///C:/Documents and Settings/ArchiteKt/My Documents/DZN2/RSK/dev/fla/index.swf cannot load file:///C:/Documents and Settings/ArchiteKt/My Documents/DZN2/RSK/dev/fla/albums.swf. Local-with-filesystem and local-with-networking SWF files cannot load each other.

( God, don’t all the folder addresses look silly from here? haha. )

But anyway, perhaps someone can shed some light on what I’m doing wrong.
Any help is appreciated.