Leopard - trackpad doesn't work

I bought a new macbookpro 15" (the release just before unibody)
My macbookpro was prepared and partitioned by an Apple authorized reseller and I got it with one user installed and hdisk partioned with bootcamp and windows on one partition.
I decided to use migration assistant to move my previous account from an ibook to the new macbook.
Everything went flawlessly but when I am working with the new account I cannot have the trackpad working at all: no scrolling, no pinching, no rotating, ecc
Only the cursor moves ... at least!
Instead with the account already installed (the one not migrated) the trackpad works without problems.
Have you any suggestion to solve the problem?
Thanks
Alberto

 

Leopard - trackpad doesn't work

I analyzed better the situation and it is much more strage than I thought: actually it is only the scroll with the two fingers on trackpad that does't work.
All the other gestures work.
??!!!???