It's safe to delete the problem files in directory C:\WINDOWS\Downloaded Program Files as said above, i.e. right click on them and select Remove (select Properties to determine the source etc.).

These are ActiveX controls. To check whether you will be prompted to download these again when you visit certain web sites, go into Tools/Internet Options in IE and select the Security tab. For the Internet zone, click on Custom Level and check the first three settings relating to ActiveX controls. I would suggest you set the first setting to prompt and disable the other two relating to unsigned/unsafe ActiveX controls.

To install Macromedia Flash and Shockwave players visit this URL: http://sdc.shockwave.com/shockwave/d...rameset.fhtml? .

AFAIK, enable install on demand relates to additional IE components not installed when you first set up IE. For instance, if you surf to a Japanese web site, you may be prompted to install Japanese language support.