joomla 404 - Component not found error problem

Hello :

My website was working fine until yestrerday that on some of the pages I get this error : joomla 404 - Component not found error
what I get is that in those pages it tries to open the address of that hot start that I first intalled , as you can see it your self please tell me what has happened ?
I can also give you my joomla admin pass if you need it
many thanks

Some files in your joomla folder are deleted due some reason.

If you tried to un-install component by manually deleting files and you are in shame to tell us that , you can return files from original package, then follow regular uninstall procedure.

Also your problem may be result of virus activity.

No files were deleted. Just to let you know how the problem was solved : In Global Configuration the value "Use Apache mod_rewrite" should be set to True, and, surely, htaccess.txt should be renamed to .htaccess