Hi,
Ever since moving to my new computer (Vista->7) I've had quite a few problems with running Touhou (I kinda just copied my files from the old computer). At first they all worked fine (at least as far as I can remember), however, after a while most of them stopped working. The screen would switch to Touhou mode, on PCB and the older ones the loading screen would appear, and then it would minimize and stop working. The only one that works consistently is Mountain of Faith, which even sometimes doesn't work, while the rest only work if I'm lucky. Just today SA worked and I played a bit, but when I closed it and tried to open it again, the same problem cropped up.
At first I thought it was the Windows Aero theme, because when I switched to basic, they suddenly all worked. Then the next day they all stopped working and some would start working when the theme was switched back to Aero. Seemed like kinda a freak occurrence since switching the team no longer has any effect.
The computer has also gone through a factory reset to try to fix my screen colour problem (unrelated, and someone's coming to fix it today), but it had no effect on Touhou starting problems.
EDIT: Hold on just saw the sticky, gonna try it now Turns out I'm already Japanese locale, same situation