I have dual operating system in my PC. I have loaded Windows 98 in C drive and Windows XP in D Drive. I have Installed Pico software in Windows 98 and also in Windows XP. I am using ADC 212/100. When I boot with Windows 98 ADC 212 is working fine. But when I boot with Windows XP ADC 212 does not work. The driver is not at all recognizing the ADC. It gives a message " ADC unit not found on LPT1". I tried by changing the LPT numbers as mentioned in the help file. Even I tried by changing the configuration of the port from ECP to EPP and so on. It does not work in XP. But the the same ADC unit,same cable and same port wotks with windows 98 on the same machine. What could be the reason?