Digital Multimeter (220-0168) Troubleshooting Faxback Doc. # 14322 with PC Interface WINDOWS SOFTWARE LOCKS UP IN THE INSTALL PROCESS. Look in the \WINDOWS\SYSTEM directory for the file THREED.VBX (this is what is causing the hangup). Delete this file, and reinstall the software; it will work fine. The new version of the INSTALL disks will correct this problem. DOS SOFTWARE WON'T INSTALL CORRECTLY. There is a file called SAMPLE.MNU which needs to be renamed to SAMPLE.RUT; this will fix the problem. (TLC/all-03/22/95)