I can't move right and down. Interestingly enough, it seems as if the "up" and "left" buttons were slightly pressed continuously, since when I use the "down" and "right" keys in my keyboard, the character basically takes "broken steps". However, what's weirder, is that the character doesn't move up and left constantly, so it's NOT the keys being pressed either.
And my gamepad is properly calibrated, yes.
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AMD Athlon 64 x2 5600+ ~2.9 GHz
XFX GeForce 9800 GTX+ 512 MBs
2 GB DDR2 ~800 MHz