So this was a collaboration flash from Futaba Channel back in 2004 when Os-tan was being created.

The original flash (which can't be uploaded here anymore) is archived here: https://archive.org/details/troubled_windows_flash

I don't know how many of the contributing artists weren't anonymous at the time, or could be tracked down today, but if anyone knows them (or other tagged references) please feel free to add them to the tags.

The "GIGA TGL" in the copyright notice is actually the company behind the visual novel Colorful Kiss which is where the OP music is taken (and the subtitles are parodying the original lyrics).

Shinjidude said:

The original flash (which can't be uploaded here anymore) is archived here: https://archive.org/details/troubled_windows_flash

The SWF actually has been uploaded over at post #269585 along with an entire flowchart of branches that are hidden in the flash. Though it was sent back to the moderation queue and subsequently deleted for reasons I don't understand. Good ol' Quality Check

IIRC It's archived on danbooru: post #269585
EDIT: oof, someone beat me to it.
Also, as this is the "opening" for Troubled Windows, there's also an "ending" movie with Futari no Xenopittan as its song.

Well shoot, I even searched for it (and was surprised to not find it because I was sure it was here). Thanks for pointing it out.

EDIT: Fixed the "quality check" issue

Trouble Windows

What a master peace