does not work . error: unable to find project or library

hi will thank again and again for your help. I'm not going insane, I would just like to understand. I know, I am maybe wating my precious time and I'd better finish my cylinders and my new valve. I know... well. The last question before I give up: what libraries have to be selected in VBA Project reference in order to let your xla to work, or at least what libraries and what versions does the addin requires? is there any name conflict? I had troubles with some apps for MSAccess requiring MSDAO 3.5 instead of 3.6 ... my excel is an XP (2002) version, I am running win2k ... and sometimes when I click the icon XL complaints of missing libraries and opens the VBA Project.if I select VBAProject (xlequations.xla) it complaints missing library. boh?!? Bye have a nice day! Marco