Perhaps a step in the right direction..let's hope...since you are now getting BFFF003E and BFFF0011 errors.
Recommend you uninstall your KUSB-488B GPIB driver.
Also uninstall NI 488.2 (if exists.....you have to first select National Instruments Software and then press uninstall/change to find this).
Remove C:\windows\system32\gpib-32.dll if exists.
Then download and install the latest KUSB-488B driver from here
http://www.keithley.com/support/data?asset=52970
Install it as NI command compatible.
After installing and rebooting, check the NI-VISA passports again and ensure that only the "NI-VISA Passport for GPIB" is marked on.
Repeat the checks suggested to verify the GPIB driver and instrument:
First, run the Configuration Utility first to confirm the Gpib0 and instrument are both seen.
Then run the Diagnostic Tool and confirm you can communicate with your instrument : start with Initialize, enter *idn? in the text box and press Send, then get the response by pressing Enter.
If this works, repeat the VISA interactive test to see if GPIB0 and GPIB0::25::INSTR both appear. Confirm you can write and read to GPIB0::25::INSTR.
If this works, repeat the LabVIEW test with the simple write/read vi that was attached previously.
Hope you get better results.
