thank you for your reply.
1) I followed the instructions for FixPolocies.
However I did not understand what you mean by:
"This will enable your Control Panel and stop the Administrative warnings, if any malware infection resets the registry policy keys again."
2) I still can't access microsoft and cisco sites.
3) I removed both the IE icons. However a strange thing happened. I deleted both icons and then opened Recycle bin, and to my surprise there was a Firefox icon in it. Just to check if I deleted the correct icon, I restored it and on desktop it appeared as IE icon. So I deleted it again and it was as Firefox in Recycle bin. I deleted it and from the start menu sent a shortcut for IE on desktop and it works well now.