Microsoft Excel 2010 cannot be opened -try to repair the product in control panel-I ntry changing the click-to-run application mgr but will not open
Try running a Diagnostic: Running Microsoft Office Diagnostics from the Start Menu
Click on the Start button
Click All Programs
Click Microsoft Office folder
Click Microsoft Office Tools
Click Microsoft Office Diagnostics
Click Continue
Click Run Diagnostics
My microsoft office does not have a diagnostic tab in it(Home,student version)
Try from within Excel/Word: Running Microsoft Office Diagnostics from within Excel/Word
Click the Microsoft Office button
Click on the Excel/Word Options button to bring up the Excel Options dialog box (at the bottom of window)
Click on the Resources button in the left hand pane
Click on the Diagnose button in the right hand pane
Click Continue
Click Run DiagnosticsIf that does not work then you will have to do it from Add/Remove in the Control Panel.
Click Start
Click Control Panel
Click Add or Remove Programs
Scroll down to the Microsoft Office Home and Student entry
When you click on the entry, there should be TWO buttons on the right side.
One labeled Remove
One labeled ChangeClick on the Change Button,
You should be offered three choices,
Add or Remove Features
Repair
RemoveSelect Repair
Click ContinueSee if that helps.