Vista login "incorrect username or password" with correct username and password entry

Windows Vista x6

Have always used automatic login before. Recently added secon
administrator account so login screen now appears. When correct passwor
is entered, the computer says incorrect username or password. This i
true for both accounts. Can not get past the log in screen at all. Ca
not log into the system

When the password has been used to authenticate administrative task
previously, it has been fine. Don't believe I have ever used the logi
screen before so this issue may have existed before the second accoun
was created and only made apparent by this addition

 

Do you have the same problem logging on in SAFE MODE

 

1.Check your system any tool do you have some kind of viruses
2.Check do you have the same problem in safe mode - if not->you'l
change all passwords or rese
3.If you can't login in safe mode as well independly do these account
have passwords or not reset them by using ->'Offline NT Password
Registry Editor' (http://home.eunet.no/pnordahl/ntpasswd/

 

There are no viruses. Also cannot log into safe mode. Same proble
occurs. NT registry editor did not work. Temporary work around foun
using System Restore

 

I have the same problem. I have installed a fresh and genuine copy of Windows
Vista Ultimate x64, do some logon/logout and the system start to refused my
password on every account on my computer, even in safe mode. After a lot of
restarts, the password start working but only for a short time. After some
researches on the Web, I have found that some Toshiba laptop users are
complaining about this problem. I have a Lenovo Thinkvantage T60 computer
with the more recent firmare and BIOS updates installed.