Sneaky....location bar - how to delete autocomplete

To cut to the chase - I dont want my kids knowing which porn sites I've been to.....

I've managed to setup a reg file to delete the location bar drop down stuff
[HKEY_USERS\.DEFAULT\Software\Microsoft\Internet Explorer\TypedURLs]
I can also edit my hy history file to remove the pointers (at least) to the history pages in internet temporary files.

- but it still has the autocomplete available - say when you type in www.XXX...whatever it will autocomplete with lesbian sex or whatever....is highest in the tree...

Of course you can delete it by Tools options delete off line and whatever - but that delete my history folder too and I havent liked doing that....

eg: I cleaned up the drop down with my regular .reg file but when I type www in the lcation bar - it autocompletes with say www2.xxx.....
however when I search my regedit and my hard disks through Windows Explorer (as opposed to internet explorer) - nothing is found - it's like it's hidden in a cab file or alternate code.

TIA