Cant open Excel files. Not even from emails with Excel attached

Excel and Word are two parts of the Microsoft Office Suite that have become standards tools for spreadsheets and word processing.
Among their features are the ability to easily exchange information.
For example, you can easily copy a cell or part of a spreadsheet from an Excel and paste it into a Word document, which preserves all the formatting.
This method requires opening up both programs at the same time.
To avoid this, you can insert an Excel file from within Word itself.

Choose the "Insert" tab inside Microsoft Word to display the Object dialog box.
Click the "Create from File" tab and Browse to display the Browse dialog box.
Navigate to the Excel file that you need and double-click to load its name into the File Name box of the Object dialog box.

Click a checkmark into the "Link to File" box if you want the table that you insert to be automatically updated anytime the original file is changed.
Otherwise, leave it blank if you don't want the inserted information to be affected by the original file.

Click "OK" to insert the Excel file as a frame into the document.
Note how only filled cells from the first table (worksheet) of the file are inserted.
Blank cells are not inserted. You can resize the frame by clicking it and dragging the handles that appear.
You can also click it and drag it to a different line within the document.


http://office.microsoft.com/en-us/word-help/link-or-embed-an-excel-worksheet-HA010120810.aspx - BM4

Excel and Word are two parts of the Microsoft Office Suite that have become standards tools for spreadsheets and word processing.
Among their features are the ability to easily exchange information.
For example, you can easily copy a cell or part of a spreadsheet from an Excel and paste it into a Word document, which preserves all the formatting.
This method requires opening up both programs at the same time.
To avoid this, you can insert an Excel file from within Word itself.

Choose the "Insert" tab inside Microsoft Word to display the Object dialog box.
Click the "Create from File" tab and Browse to display the Browse dialog box.
Navigate to the Excel file that you need and double-click to load its name into the File Name box of the Object dialog box.

Click a checkmark into the "Link to File" box if you want the table that you insert to be automatically updated anytime the original file is changed.
Otherwise, leave it blank if you don't want the inserted information to be affected by the original file.

Click "OK" to insert the Excel file as a frame into the document.
Note how only filled cells from the first table (worksheet) of the file are inserted.
Blank cells are not inserted. You can resize the frame by clicking it and dragging the handles that appear.
You can also click it and drag it to a different line within the document.


http://office.microsoft.com/en-us/word-help/link-or-embed-an-excel-worksheet-HA010120810.aspx - BM4

Please download the attachment from the E-mail and then open the downloaded file, if the issue persists. Please uninstall and re-install the Microsoft Office. If you are worried about purchasing Microsoft Office, you can download and install the Open Source freely available OpenOffice which can be used to read and write Microsoft Documents like Word, Excel...etc from the below link :

http://www.openoffice.org/

Try to Restore Microsoft Excel to Its Default Spreadsheet ,
Open Microsoft Excel.
Navigate to the Help menu and open the "Detect and Repair" function. The Detect and Repair dialog will appear. If you want to restore your shortcuts at this time, check the appropriate icon
Click "Start." Wait for a short period while Office deletes all of the settings on all of the programs in the suite and restores it to its original installed state. This will apply the settings to Word, PowerPoint and Excel, and any other Office programs you have installed

IS YOUR EXCEL 2003 OR 2007. I WILL TRY MS OFFICE 2007
BECAUSE VISTA SOMETIMES HAVE PROBLEM READING SOME PROGRAM IN MS OFFICE IN 2003. EVEN WORD 2003 SOMETIMES HAVE PROBLEM IN VISTA. DEPAND ON THE COPY YOU INSTALL. I HAD PROBLEM WITH IT SO MANY TIMES

GOOD LUCK

try downloading excel viewer ,,,,on other machine