Hi Oscar,

>I have a pos software that runs without any problem in windows xp, but now i can not make it print with windows vista.

you need a driver for Windows Vista. Drivers should be available from http://pos.epson.com/developers/index.htm, I don't know, though, if they already released a Vista driver. The following page seems to indicate this, though:http://www.svcommunity.org/forum/index.php?action=printpage;topic=62218.0