Excel Annotates 1 when saving already existing workbook

Funny way my Excel is working. Let me explain what is happening on my machine. lets say, I already have a workbook named lesson.xls I open this workbook, make the necessary changes required and when I press Save Icon or CTRL + S, Save as pop-up menu pops up and if I look at the file name in the filename dialog box, it shows lesson1.xls

As you see, we have two issues. Why is Save - As pop up menu comes out when I press Save Icon? And why is Excel Appending the already named workbook with numeral "1".

I hope you can look into this issue and help me resolve it. This is happening a quite heck of time on my Excel files.

Thanks

Ram P

Neale,

I have not set up any templates nor it works on only one file. It works for all my files. I dont know why this is happening.

Thanks for your help in helping me resolve my issue.

There are no add-ins checked with my Excel. And they are not in read only mode.

Funny thing which I observed now is that when I double click a Excel file, it annotated the file name with "1". Just observed this !!!

Do you want me to re-install Excel ?

Its happening with Excel only. And not with any other applciations. I work at office. I am on Win 2000 SP2.

Thanks

Ram P