There was a bug in the MXI-3 software that could cause a Windows page fault exception (0xE) on Windows 98. It is very rare, but there is a patch to fix it. I attached it below. If this does not solve the problem, please email us so that we can help you further. Go to http:\\www.ni.com\ask and select Email an Engineer. You will want to select PXI/VXI for the product.