Hello,
1. Please try a different slot in the computer.
2. Take out any card if present and put this card and see if the error goes away or not. then put the others.
3. Go to Device Manager and see if there are some yellow question marks. If Yes, then right click on them and do uninstall. After that, again "scan for hardware Changes" and see if the computer detects new hardware and if the hardware shows up as Data Acquisition Devices in Device Manager. If yes, then it sould be working fine.
Please do let me know how it goes.
Sincerely,
Sastry V
Applciations Engineer
National Instruments