Can anyone please help me? and I am not computer literate

I have a Pre 3 which I sync with my Palm Desk top, my To-do list has disappeared on both my hand held and desk top and my memo has disappeared from my hand held only.
I was usuing Chapura for the sync but they are no longer in operation.

How can recover the data so I can have it back on both my device and desk top?

Also is the place on my PC which stores my Palm data so I can recover it?