Thank you for your reply.
Is the computer with Win2000 a different one to the computer with WinXP? The compatibility of the parallel port could still be an issue, even though printers do run on it. This is because printers use less pins than our units and some manufacturers do not connect the pins not being used by printers.
Yes, it's exactly the same computer, I just upgraded OS from Win2000 to Win XP SP2. So I'm quite sure it isn't a physical hardware problem (no pins damaged).
Make sure that the printers are pointed at a different port or uninstalled as these could be causing a driver conflict.
Of course, when I wrote my first post, I had already uninstalled all printers to make sure they weren't interfering.
What mode is the parallel port set to in the BIOS?
Sarah, what I was telling you in my first post was that I couldn't access any option of parallel port modes in the BIOS of my Compaq notebook because of its own limitations. Compaq Help desk told me that wasn't available in my BIOS version, and that there were no updates. Do you know of any program utility that would let me check and eventually change these port settings, apart from BIOS setup?
Anyway, I'm not quite convinced it's a hardware problem. How would you explain the BIOS settings haven't changed during the OS upgrade between Win2000 and Win XP SP2 (which would imply parallel port settings remain the same) and however ADC-212 worked fine before but is stucked now? Don't you think it could be a software bug in the way PicoScope administrates parallel port data exchange in Win XP SP2? Or do you think instead that Win2000 and Win XP SP2 assign different modes to parallel ports?
Hope hearing from you soon, thank you again!