ok people, I hadn't been ince I was well pissed off.
I just bought a new pc with these specs:
AMD Athlon 64 x2 processor 4000+
2GB RAM
NVIDIA 6150 SE GPU 128 MB dedicated memory.
IEEE 1394 firewire interface
Windows Vista.
I tried all the setting and still gp3 1.13 runs with a PO of more than 200%, when on my old pc it run fine, except with the belini,s track which were more demanding.
I am really stuck here, any help is welcome.