@
Notsobraveheart - I am guessing you did the uninstall when calibre was running.
Did you try to delete them after a reboot ? That should work.
If you still cant delete then try to unlock the files with something like unlocker ==>>
http://www.emptyloop.com/unlocker/ and then try delete. If still no go, get unlocker to do the delete on a restart.
unlocker is a shell extension - i.e. you drive it from right click menu in Windows Explorer (File Explorer if you're on Win8)
BR