Problem with mshtml.dll/Active Desktop Html. Pls Help

Hi there... I have got two(2) problem. Pls help me.

------------Problem One---------------------------
I am having a problem with my computer Win98. The problem is that I am getting an error message all the time i.e. "The Active Desption Html cannot be found. Click Ok to turn off your Active Desktop"

To solve this problem I have renamed mshtml.dll (Coz I think it is corrupted) to mshtml.xxx and I have downloaded new mshtml.dll

But things doesn't seem to work fine.
Please tell me what to do.

------------Problem Two---------------------------
I am having Internet Explorer. And I am not able to type anything inside the Textbox of internet explorer(i.e. the control doesn't go there at all ) I can't even edit anything in Textbox. It is because there is something wrong with mshtml.dll or is it because of something else?

Thank you for you help.

Have you tried un-installing and re-installing Internet Explorer?

Put in your system disk (hold the shift key down to kill auto-play) once the flickering light stops on the CDROM go to > start > run >sfc /scannow > enter, and sit there and babysit the prompts until its over. This should "restore" the system .dlls to original. This is a good starting point for trouble shooting M$ . Do this then report back here.

:)

Thank you for you kind reply! Now I have one question...sounds funny but now I am trying to uninstall the Internet Explorer from the Add/Remove Programs but it is not listed there.
So is there any other method of uninstalling the Explorer
Thank you.