Are you using any scan cards with the 2750? Or using it as a DMM to measure Ohms of a single devices at a time.
The 2750 can be controlled by sending the SCPI commands that it understands over GPIB or RS-232.
The SCPI commands are documented in the 2750 manual.
The KickStart software can interface with 2750 over GPIB interface.
The Windows computer will need a GPIB interface from National Instruments or Keithley (KUSB-488B).
If using scan cards, use the datalogger application of KickStart (KICKSTARTFL-DL).
If not using scan cards, use the DMM application of KickStart (KICKSTARTFL-DMM)
More info:
KickStart