Solution to Problem: Error while saving Excel 07 System Error &H80040111 (-2147221231). ClassFactory cannot supply requested class

Error while saving Excel 07 System Error &H80040111 (-2147221231). ClassFactory cannot supply requested class

Hi,
      I have excel 2007 installed and I just had replaced MSCOMCTL.OCX file in order to resolve problem regarding 'TreeViewControl', but it didnt resolve that problem then I reverted back the changes and placed back original file and registered it back.
After
this i started getting above mention error multiple times (atleast 5-6 times) when i try to save any excel file.
I am not sure is it related to the changes that i  made or not.
Does anybody has solution for this problem?

Anwsers to the Problem Error while saving Excel 07 System Error &H80040111 (-2147221231). ClassFactory cannot supply requested class

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