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Err Msg: RUNDLL32.EXE Has Caused an Error in COMMCTRL.DLL

You may receive one of the following error messages and Windows 95 may stop responding (hang) or run with limited functionality:

RUNDLL32.EXE has caused an error in COMMCTRL.DLL
The COMCTL32.DLL file cannot start.

This error means the Commctrl.dll file is missing or damaged.
To resolve it.
restart the computer and press f8 when the starting windows 95 message, choose Command Prompt Only from startup menu.
Type
cd\windows\system
ren commctrl.dll commctrl.old
Use the extract tool to extract the Kommctrl.dll file from precopy1.cab file from your win95 folder on the cd-rom to windows\system filder
warning about it though.
NOTE: The Precopy1.cab file also contains a Commctrl.dll file. This file is used only by Setup. If you extract this file instead of the Kommctrl.dll file, Windows 95 will not run.

that is about all I can remember
when we had this problem on my daughters win 95 computer.

if you need more information about it search microsoft for RUNDLL32.EXE

Good luck