MSCOMCT2.OCX error

I get an error when loading a userform in Excel that has a datepicker control:

“Run Time Error ‘459’ … Object or Class does not support the set of events”.
Both in Excel 2007 and 2003. Under Windows XP.

I tried to resintall the control (regsvr32, with success) but now I get the
error : class factory cannot supply requested class. I bleieve I installed an
Older control.

Did anybody has these problems before?
How can I update MSCOMCT2.OCX properly?

Thanks for any help.
JM

Are you using any class modules in your project?

Is this happening on all projects (for instance, if you started a brand new project, would you be getting the same error), or is it happening in just one particular project?