FWIW I can use Microsoft Date and time Picker Control 6.0 (SP6)
Mscomct2.ocx dated 9/3/2004
Windows 7 Professional 64 bit
I seem to have 2 versions of regsvr32.exe dated 14/7/09 (new PC *December* 2009)
I suggest you find yours and put the full regsvr32 path when running.
Please let us know how you get on.