Hi, Thanks for your answer.
what i recently did to check out:
- made new install on other hdd => same error

- installed it on my homepc(also XP) -=> works fine
i have a special xp driver - ( its called host bridge - just to give a virtual com port to usb gps )
Now my last chance is a USB PCI card - it it won't work i have 2 possibilitys - change the mainboard and buy a new one

[too expensive]
or try to change the gps in a normal com-port one. [depends if the seller wan't to]
Regards felix