Trackball Explorer jumpy after using usb-to-ps2 converter

Hi all,

I have this 1-yr old Microsoft Trackball Explorer 1.0. It was doing great, until recently I needed a mouse for my other computer. I used the USB-to-ps2 converter on this trackball, and I think it messed it up inside. The mouse cursor is now jumping around and becomes "unplayable".

It says it's PS2/USB compatible on the bottom of the mouse.
I use the latest mouse driver from Microsoft and cleaned the trackball.

I wonder is there a "fix" available?

Thanks.

You won't get the same responsiveness with ps/2 as you would with usb, which could be annoying if you play "fast-twitch" games like Quake III or something. Else, have you looked at the mouse properties in windows? Perhaps they reverted to some slower default setting.