Username or Password incorrect Windows 7

AMTECH69

Broken In
I had only one user with admin rights. recently i created another user with restricted rights. Within 2 or 3 days of that the error message started appearing with a red cross "Username or Password incorrect". This message appears as soon as the windows loads, no log in screen displayed, when clicked in the password box below this message a altogether different username (something "chftg") appears which was never created by me. The two usernames created by me are not displayed.

Only thing i can think about is somebody not knowing either of the passwords has tried his hands at it.

Pls provide a solution. It was pre installed and I dont have any CD of OS.
 
OP
A

AMTECH69

Broken In
I got it reinstalled.
Now,I am admin user of this machine and I wish to know the startup and shutdown timings of each user. If possible, login logout details of each user. Pls help.
 
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