New versions of two microcomputer programs LT and ETLT for positron lifetime spectra analysis are presented. The programs work in WINDOWS 95-20000/WINDOWS NT operating systems and use 32-bit arithmetic so the calculations are fast and easy in operating. The LT program allows a positron spectrum to be analyzed in terms of discrete components, as well as in terms of continuous sum of the decay curves given with a log-normal distribution. ETLT serves for analysis of spectra of polymers and other materials containing cavities in their structure. ETLT makes use of a model assuming slow positronium trapping into a cavity, which leads to a distribution of the ortho-positronium lifetimes and influences the shape of the lifetime spectrum.