My MS Office is Office 2003.

While open a new workbook in Excel, the sheet tabs are not shown, I need to
set by tools - option and check the sheet tab every time. How to set the
workbook opened with the sheet tabs ?

Also, there is a extra menu tab "addin" shown at the top menu of workbook,
i.e. File, Edit, View, Insert, ...., addin, Help. While addin is clicked, a
message of "solution.xls not found" shown. How to fix it ?