Hi TN,
I've tried to defragment the hard disk, but I didn't solve the problem. The application is only 4MB and I don't think that I have problems with the memory, because I still have 2GB free space on the harddisk and I'm using a computer with enough memory. The OS used is Windows XP and the driver is NI-DAQ 7.1. I'm using another PCI card to have an extra serial bus, do you think that this card could be a problem? could be something with the interrupts of both cards if they have to sharre the PCI bus?