How do I get rid of stuff Systemworks won't remove?

I have just run Norton WinDoctor.  It came up with six items it will not fix.  The first item on the list is:

 

Invalid Icon: C:\PROGRA~1\SmithMicro\CheckIt\WCOMXLB.PIF

The icon C:\WIN95\SYSTEM\PIFMGR.DLL cannot be used.  The icon file might have been deleted or the .DLL file might be corrupt.

 

There are five other related items.  I've run WinDoctor three times and it will not fix these problems.

How do I get rid of these?

 

John