http://kb.palisade.com/index.php?pg=kb.page&id=528
Close Excel and Project.
Click Start » Run, type REGEDIT and click OK.
{00020813-0000-0000-C000-000000000046} Key for Excel
Click on Computer at the top of the left-hand panel, then press Ctrl+F to bring up the search window. Paste this string, including the curly braces {…}, into the search window:
{00020813-0000-0000-C000-000000000046}
Check (tick) the Keys box and Match whole string only; clear Values and Data.
Click the + sign at the left of {00020813-0000-0000-C000-000000000046} to expand it. You will see one or more subkeys:
1.5 for Excel 2003.
1.6 for Excel 2007.
1.7 for Excel 2010.
1.8 for Excel 2013.
1.9 for Excel 2016.
Identify the one(s) that do not match the version(s) of Excel you actually have installed. If all of them do match installed Excel versions, omit steps 5 and 6.
You are about to delete the key(s) that correspond to versions of Microsoft Excel that you do not have. For safety’s sake, you may want to back them up first. Right-click on {00020813-0000-0000-C000-000000000046}, select Export, and save the file where you’ll be able to find it.
Right-click the 1.something key that does not belong, select Delete, and confirm the deletion. Repeat for each 1.something key that does not belong.
The {00020813-0000-0000-C000-000000000046} key can occur in more places. Usually they all have the same subkeys, but not always, so you need to examine each instance. Tap the F3 key to get to each of the others in turn. For each one, repeat steps 4 through 6 (click the + sign, export the key to a new file, and delete the orphaned 1.something entries).
{2DF8D04C-5BFA-101B-BDE5-00AA0044DE52} Key for Office
Click on Computer at the top of the left-hand panel, then press Ctrl+F to bring up the search window. Paste this string, including the curly braces {…}, into the search window:
{2DF8D04C-5BFA-101B-BDE5-00AA0044DE52}
Check (tick) the Keys box and Match whole string only; clear Values and Data.
Click the + sign to expand the key. You will see one or more subkeys:
2.3 for Office 2003.
2.4 for Office 2007.
2.5 for Office 2010.
2.6 and 2.7 for Office 2013. (2.6 and 2.7 are okay for Office 2016 as well, if there is a reference to Office16 under 2.7.)
2.8 for Office 2016.
Identify the one(s) that do not match the version(s) of Office you actually have installed. If all of them do match installed Office versions, omit steps 10 and 11.
You are about to delete the key(s) that correspond to versions of Microsoft Office that you do not have. For safety’s sake, you may want to back them up first. Right-click on {2DF8D04C-5BFA-101B-BDE5-00AA0044DE52}, select Export, and save the file where you’ll be able to find it. (Choose a different name for this file, such as Key2.)
Right-click the 2.something key that does not belong, select Delete, and confirm the deletion. Repeat for each 2.something key that does not belong.
The {2DF8D04C-5BFA-101B-BDE5-00AA0044DE52} key can occur in more places. Usually they all have the same subkeys, but not always, so you need to examine each instance. Tap the F3 key to get to each of the others in turn. For each one, repeat steps 9 through 11 (click the + sign, export the key to a new file, and delete the orphaned 2.something entries).
Close the Registry Editor.
If you run @RISK with Microsoft Project, p