Hi, i actually work with Windows 95 (version 97) OS and encountered similar messages : - too many parameters - environment out of memory for all programs of the ifeffit package Nevertheless, even if these messages appear, the programs TkAtoms, Gifeffit run without problems... It is not the case for APT that stays without running... Guilhem DEZANNEAU ___________________________________________________________ Do You Yahoo!? -- Une adresse @yahoo.fr gratuite et en français ! Yahoo! Mail : http://fr.mail.yahoo.com