USB gamepad makes game view drift down

I bought a USB game pad (
http://www.ebuyer.com/customer/products/index.html?action=c2hvd19wcm9kdWN0X292ZXJ2aWV3&product_uid=76192
) to play America's Army. The problem is that the view in the game
steadily drifts downwards. I can correct the view it with the mouse,
but as soon as I stop using the mouse, the view drifts down again.

I've calibrated the gamepad using the control panel, and I've tried
various settings in JoyToKey (
http://www.electracode.com/4/joy2key/JoyToKey%20English%20Version.htm
).

I've searched google groups for answers, but haven't found any
solutions yet.

I'd appreciate any suggestions!

.

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