Ok, I screw a lot.
I installed LV7.0 on a computer with PC-LPM-16 card and Win98. I installed the NI-DAQ 7.0 and could not use the card. I checked the NI web-site and found that I need to use NI-DAQ 6.9.3.f5. I tried to remove NI-DAQ 7 and install NI-DAQ 6.9.3 , then I found that I need to work under Win2000. I upgraded to w2k and I got a piece of 6.9.3 that is not working, and cannot be uninstalled either.
Can I clean up the drive from the NI-DAQ residues somehow and attempt installing the (LV7 and) NIDAQ 6.9.3f5 again?
Sincerely, Grigor