Character constantly moves on own

[KrackoCloud]

Hohum, now this is really strange.
In SA, the game basically thinks that I'm holding up-left the entire time, from the start of the menu to ingame.
Actually, the exact same thing has happened to Valkyrie Sky.

Interestingly enough, other games like UFO and UNL aren't affected by this at all.

Any ideas?

[Serela]

Make sure Num-Lock isn't on when you play. That'll mess it up for sure.

[KrackoCloud]

No good. I tried turning off NumLock, but nothing's changed.

EDIT: It seems that when I unplug my keyboard, the problem persists on its own, so maybe this is a virus or something?

[KrackoCloud]

I tried DL'ing a copy off the internet.
The first time I tried it out, the problem was still there.

I'm really starting to think this might be some obscure virus or something.

Any ideas? I'm getting rather desperate.

[Alfred F. Jones]

For starters, you could refrain from openly admitting to pirating Touhou games.