Hi, I can't seem to get any Excel Add-Ins to work. In particular, I need the 'Solver' for an assignment ... I've tried with two office versions (2007/2003), which I've managed to install successfully (you have to enable the Solver add-in during installation), but it's the same every time. When I try to start it up I get a message saying can't access SOLVER.XLA, and then '400'. Initially I got a msgbox with squares in it - this was fixed by adding dcom98 with winetricks. I would like to simply know whether someone has been able to successfully use this ('tools' -> 'solver...' after enabling it in 'tools'->'add-ins...') in any version of office, or whether I'm simply wasting my time. Alternatively, if someone knows of a free linux spreadsheet application that has a non-linear solver, I would be grateful. I've already tried OO3 and gnumeric.