So in your Users folder, there is not entry for both H and h?
If you go to your User Accounts dialog, is there another user listed there? Search box type control Panel and go to User Accounts..
If the listing above came from an upgrade attempt after you had removed the Oracle software, you still have those service profiles installed.. or showing as installed.. You also show a user profile for your system.. Do you know why that is there? Are you running a Domain type install? That one also does not show in the net user listing.. You might need to use the Domain switch with Net User to see it.. Maybe something like
net user /domain
I don't know anything about a Proxy Server, but are you using one of those? VPN operations going on with the system..
As you can tell, at this point I can only guess about some situation which may be involved..
Could you have originally set the user as h and later changed it to H?