If you have Internet Explorer 4 installed
Click on start | run
In the run box type:
Regsvr32.exe /i shdocvw.dll
and click OK.
Then skip to the common part below

If you have Internet Explorer 5 installed
Click on start | run
In the run box type:
Regsvr32.exe /i shdoc401.dll
and click OK.

Common part for both versions of Internet Explorer
Click on start | run
In the run box type:
Regsvr32.exe /i mshtml.dll
and click OK.