Printer prints only half pages! Canon ip3000

My printer, Canon pixma ip3000 prints only half pages. It
prints only the first lines in the document, starts on a new
page a couple of lines, a new page again….
I have tried to disconnect the printer, remove all software
and drivers, restart the pc and then install the drivers
using the original cd, but it doesn?t seem to help.
A couple of days before I detected the problem, I used a
program called
Ashampoo Winoptimizer to optimize the system. It might
have something to do with that?

Can anybody help me?