You either do not have CSWSK32.OCX or it is not registered properly.

Open up Windows Explorer and search for the file CSWSK32.OCX
It should be in either:
C:\Windows\system\
or
C:\Winnt\system32\

If you don't find it you'll need to get it off the web and put it in one of the aforementioned locations.

Then:

Goto Start Menu - Run - then type in:
regsvr32 c:\windows\system\CSWSK32.OCX
or
regsvr32 c:\winnt\system\CSWSK32.OCX