How to fix Excel as a result of the Microsoft Security Updates (Pre Excel 2013)


There have been 2 Microsoft Security updates that have caused problems with Excel.

The steps we have found to fix the problems casued by these Security Updates are:

1. If Excel 2007 run the Excel Diagnostics

Ensure Excel is closed before steps 2 & 3

2. Remove the *.exd files (temp files that handle controls)

1. Open a command prompt (DOS Window) with admin rights (right-click – Run As Administrator)

2. Navigate to the Documents and Settings folder    C:\Documents and Settings> (C:\Users  on Windows 7)

3. Enter the following:   C:\Documents and Settings> del/S/A:H/A:-H *.exd  (and press enter)

3. Reregister the MSCOMCTL.OCX file

1. Open the Command Prompt (DOS Window) with admin rights (right-click – Run As Administrator)

2. Type regsvr32.exe /u C:\Windows\System32\MSCOMCTL.OCX

3. Then Type regsvr32.exe C:\Windows\System32\MSCOMCTL.OCX


If this does not fix the issue please contact