Hi all, I have an NCR machine with windows nt workstation 4.0 sp 3 on it. In this machine I have a client application that uses the machine touchscreen to capture data. It is a requirement to keep this application working with the touchscreen capturing data. I need to install a new application on this machine. The new app requires DotNet installed on this machine. And to install DotNet platform I am required to install SP6a for Win nt workstation 4.0. Problems started when I installed SP6a, because inmedialty touchscreen stops working. In my research of the solution, I found that the reason why this is happening is because sp6a reserves irq12 for PS/2 mouse and this touchscreen also sends info to system using com9 with irq12. Not the case for SP3 where irq12 is not attached to PS/2 mouse and touchscreen can used it. I also found a very specific work around for this problem. It was to disable PS/2 mouse using setup to "free up" irq12. I did it, but still I am not able to use the touchscreen, it does not matter how I configure it. All the time I have no touchscreen answer at all. To recover the touchscreen for the old application, I uninstalled SP6a and reverse setup information to its original state. Any help will be highly appreciated.