On installing Visual Studio 6.0 Professional Edition. I get the Error message "Mscal.ocx failed to register itself". This error causes the install of Visual Studio 6.0 fail. I am also unable to register or unregister the ocx using regsrv32. Any suggestions on how to get past this?

Problem solved. Posting this for others who may have same problem. Get version of Comcat.dll in winnt\system32. If version is above 4.71, get version 4.71 copy of the .dll off of the install CD, copy it to the winnt\system32 directory, register it using regsvr32, then register mscal.ocx using regsrv32. You should now be able to reinstall Visual Studio 6.0

The above fix for the Visual C++ installation also works for the Office 97 installation which produces the same MSCAL.OCX error on some Windows 95 SR2B installations. Also disable Norton Autoprotect if running any installations off CD. Thanks Shane.

mscal.ocx failed to register itself I have version 5.0 of Comcat.dll and i'm not able to get version 4.71 because i haven't any comcat.dll on the install CD. where did you got this 4.71 version ????

To get the correct version 5 of comcat.dll you need to download the file dcom95 1.3 for 95 or dcom98 1.3 for 98 from the microsoft site and install it. this will refresh and update many of the ocx and dll files.There are two version 5 comcat.dll one 6k the other 16k. I have found that the 6k one is the one to use. Hope this helps

SYMPTOMS When you install an application on a computer running Windows 95, the application setup terminates with the following messages: MSDADC.DLL was unable to register itself in the system registry. -and- Setup was not completed successfully. This error message is incomplete and does not describe the real cause of the problem. CAUSE This behavior occurs due to an incompatibility between the version of the Msdadc.dll file installed by Setup and the existing version of the Ole32.dll file on the target computer. RESOLUTION You can work around this issue by installing Distributed Component Object Model (DCOM) for Windows 95 or Internet Explorer version 4.0 or later. You can install DCOM for Windows 95 (DCOM95) from the following Web address: http://www.microsoft.com/COM/resources/downloads.asp ______OR_______ You can install Internet Explorer 4.0 or later from the following Web address: http://www.microsoft.com/ie/download/windows.htm