I am using ICS usb 488 gpib to usb card. It used to work fine with labview 8.2 but recently I installed labview 8.2.1 and it is not detected anymore by labview although it is installed properly. I get the error
NI-488: Error connecting to driver or device. ========================= VISA: (Hex 0x0) Operation completed successfully.
When you installed 8.2.1, did you also run the drivers CD that came with it? If so, then that probably installed the NI driver for it's GPIB boards and overwrote the ICS driver. Try re-installing the driver you got from ICS.