The Instrument Driver Network has a LabVIEW-based instrument driver for the Keithley 2001 Multimeter/Scanner. You can navigate to it by going to zone.ni.com/idnet, clicking on Downloads, and using the search interface. Select Keithley from the list of vendors and select Meters from the list of instrument types, then press the Seek button. This will bring up a list of all Keithley meters, and there are several entries for the Keithley 2001, one of which is for LabVIEW.
The direct link is:
http://zone.ni.com/idnet97.nsf/9b2b33e1993d877786256436006ec498/b293c8ef5664dfba862568ab005fbc86
But I suggest taking the long way, so that you can browse through the Instrument Driver Network, in case you need to use it again.
Mr. KB