Hello. I've spent hours searching for a specific remix of Hikari (the Japanese version of Simple and Clean). I found the song just before Kingdom Hearts II was released in the US. Unfortunately, the computer I had it on won't start up anymore. It isn't the Planitb remix or anything common like that. It's fast-paced and very techno-y. I've found a reuploaded version of the video that was made for the song, but the audio has been removed. {kingdom.hearts+techno.remix+simple.and.clean} - YouTube (http://www.youtube.com/watch?v=ofsr13fSit4)
I've searched YouTube, SoundCloud, and other sites, but no luck. Any help is much appreciated.

Chances are what you had was an amateur remix you randomly found on the internet somehow. With no other references to go by, you probably won't find your remix at all.

KH 1 and KH 1+2 Collection OST should have a Hikari PlanitB Remix "short version"
Utada Hikaru - Hikari is Japanese version of the full songs, and Colors is the English versions