[SOLVED] Windows 7 can't log on to any user account

[enduser]

I have a Windows 7 PC that has a 1 user and 1 admin account. There are no passwords on any of the two accounts. However when you click on any of the two user account icons you get the following error message: "The user name or password is incorrect". What makes this more weird is that you never get a box to enter a user name or password.

What I have tried the following so far without any success:
1. I have even removed/reset any and all passwords using a password removal utility to blank no passwords.
2. I have done a system re-store.
3. Windows start up repair.
4. Ran Kaspersky system restore ISO CD and it found no viruses.

Any help will be much appreciated.

Thanks. 

[enduser]

Solved!
http://www.howtogeek.com/96630/how-to-reset-your-forgotten-windows-password-the-easy-way/

[Boggin]

Just for clarification, what was the command line you used to copy the original sethc.exe file back ?

[enduser]

copy c:\sethc.exe c:\windows\system32\sethc.exe

[Rick]

Just for clarification, what was the command line you used to copy the original sethc.exe file back ?

well, seems they could make a fix it for that here;
and copy the data over here at least in case the website or page gets deleted like so many do these days...

[Boggin]

copy c:\sethc.exe c:\windows\system32\sethc.exe

Thanks.