So... there's no mIRC directory...it doesn't show up in Add/Remove programs...it doesn't begin at start up - are you sure mIRC is installed at all?
The default directory for mIRC is C:\Program Files\mIRC, but it might be in C:\mIRC - If you use Windows XP, use the 'search' feature in Explorer to search for 'mIRC'. Make sure you search 'all files and folders',
Regards,
