Excel 2007 won't open an existing Excel file.  Opens as jibberish symbols.  
Why?  help!

I'm using very large EXCEL Sheet for import of external data.  After I make
new calculations, which will be shown in the master-TAB.
I receive many "#N/A" values of course, but I don't care about. I just like
to make total calculation of the colums.  But result of calculation for

i cant open xls files by double clicking on them - excel open empty window
without any  error message. i try to do /unregserver /regserver , clean
xlstart directory and wait about an hour with open empty window (i read that
exclel 2007 can have lags with opening documents). file ...

When I use the ctrl button to highlight multiple cells there is no shading to
the cells that I have clicked on. The column and row headers are showing that
something is selected but not the cells. Is there a quick fix for this?

I have read through all the post about #div/0 error when making a formula
with average, but I cannot seem to get any of them to work?
I've tried entering the array formula, pressing ctrl+ shift+ enter, but it
just comes up with "the formular you have enteret contains an error"

I am subtracting a few numbers and getting a tiny error in my result  It is
happening in multiple (but not all) places on my spread sheet.  I don’t know
if this is a bug in Excel or something else.
This is an example of the error:

My file will not open if I click on the file as I normally would. I have to
be in excel and go to the Open file icon and then go to the folder and open
the file. It will always open that way. Can someone tell me what i need to do?

I migrated from Office 2003 to Office 2007 last week. Since the migration
every time I open a Excel attachment from Outlook, Excel will open, but it
will not display the data. If I click open and then cancel the window the
data appears.

I have created an Excel sheet for the recording of collected weather data
but I am getting frustrated by the non appearance of data in just three
cells.   If I put in a background colour I can see the data in white so
obviously the font has become set in these cells to white but ...

I've tried repeatedly to remove the Euro Conversion button/command off my
toolbar (using Customization/Rearrange/Delete), but every time I open a
spreadsheet, it's back.
What can I do to make the change stick?

Example:
if H5-G5 equals a negative sum I want to show zero
if H5-G5 equals a positive sum I want to show that sum
Please help

When trying to install the Data Analysis Toolpak from the "Add-in" option in
"Tools" I initially get no errors.  However, the "Data Analysis" option does
not appear in the toolbar.  If I exit Excel and reopen it, the ANALYS32.XLL
file opens as a read-only and give me the "This ...

when I try to move a column by using "cut" and "insert cut cells" I get an
error that says "cannot shift objects off sheet".  I am not using all of the
columns or rows in the worksheet so why do I get this error?

I'm trying to get a very simple DATADIF formula to work.  I subtracted the
start date from the end date of each employee to get the total number of days
they were employed.  This works fine for dates after 1900, but anything from
the 1700 or 1800's results in a value error.  Is ...

I have recently experienced problems when I start and close excel. On strting
the messdage refers to hidden module AutoExecNew and on closing it refers to
DistMon.