Weird Error (First Time I Ever Got One)

There was this pop up message in the right lower corner of my computer (Windows Vista Ultimate) -- you know one of those Balloon Pop Ups like there is a MS Update or

something the message sounded ominous about CCleaner.exe being corrupt and that I should run chkdsk.exe (though I tried doing that also) - it made reference to a DLL:

Here is a snapshot of the ERROR message:

ccleanerbj1.th.jpg

Here is the full text I grabbed:

ActiveX/COM Issue InProcServer32\C:\PROGRA~1\COMMON~1\MICROS~1\OFFICE12\ACEOLEDB.DLL HKCR\CLSID\{3BE786A0-0366-4F5C-9434-25CF162E475E}

ActiveX/COM Issue InProcServer32\C:\PROGRA~1\COMMON~1\MICROS~1\OFFICE12\ACEOLEDB.DLL HKCR\CLSID\{3BE786A0-0366-4F5C-9434-25CF162E475F}

I think this has to do with a Registry Defrag I ran just before (with TuneUp Utilities)... I haven't really changed anything else.

I was worried about running the Registry Integrity feature on CCleaner (I only run the main app).

I don't want to do any further damage before I understand what this error means. I tried Googling it but no joy.

Can anyone help?

Thanks