Microsoft Date Picker control unexpectedly stops functioning in Outlook 2010

Question

We have a long-standing Outlook VBA project that has unexpectedly stopped functioning with the error message "Object library invalid or contains references to object definitions that could not be found".
We have traced the problem to the 'Microsoft Date/Time Picker' control.  We have successfully unregistered and re-registered both the MSCOMCTL.OCX and MSCOMCT2.OCX files in the C:\Windows\SysWOW64 folder with administrative privileges.  However,
when using the free NirSoft RegDLLView utility, neither of the Microsoft common control files above shows as registered.  Furthermore, if we try to use the NirSoft RegDLLView utility to register these files, we receive an unknown error
message, unlike the successful registration using the Windows Regsvr32 utility.
Can someone please help us understand why the files appear to register properly, but apparently are not actually registered?
Is there a way to scan these files for corruption or replace them with fresh versions?

Answer 1

Thank you for the reply, Amy.  Being a novice and forced into this discussion by our malfunctioning Outlook 2010 project, we have a couple other questions, if you don't mind.
FIRST, both the common control downloads refer to users of Microsoft Visual Basic 6.0, Visual Studio 6.0., or Microsoft Office Developer XP.  We don't own any of these standalone packages, so do we have them installed as a result of
being Microsoft Office 2010 users?  There is never any mention of Office 2010 in any of the download descriptions or even other office suites.
SECOND, is one file an older file and the other a newer file?  Neither shows requirements or makes mention of Microsoft Windows 7.0 (64-bit), which we are using.  But the MSCOMCTL.OCX download does list required operating systems
up to Windows XP.  Which do we need and why don't they refer to newer operating systems?
THIRD, the downloads also talk about discontinued support for Microsoft Visual Basic 6.0 and that the MSCOMCT2.OCX file is no longer included with Microsoft XP Developer.  What is the significance of all this, these files apparently
shipped with our version of Microsoft Office 2010.  What replaces these controls if they are out-dated?
As you can tell, we are advanced enough to dabble in some VBA projects, forms, and macros, but are totally confused by the mixed signals sent by these types of articles.  If we want to continue developing projects how do know what path to
follow so we don't end up with antiquated controls or other outdated elements?  Or, are these files really even outdated?  Thank you for any enlightenment.