Mevermind. I followed a google search and found this that explained it -
I tried it and now have "stereo mix" on my Dell inspiron 1520 With Vista!
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Just thought I'd let you know that over on notebookforums, a really cool discovery has been made:
http://www.notebookforums.com/showth...169312&page=33
Basically, if you grab the XP drivers from:
http://support.dell.com/support/down...&fileid=235761
Then use winrar or a similar program to expand the EXE archive to a folder. Go into the folder, find setup.exe and right-click it go to properties. Then go to the compatibility tab and select Windows XP compatibility and hit ok.
Then run that setup.exe, and after a few minutes, you're set! Don't even need to reboot.
I've tested it here, and stereo mix works perfectly under vista from this method.
Cheers!