I can not Log on like I use to

The standard way I use to log on to windows XP is to click on the OK button on the window XP welcome screen which already had my user name type in and no password needed to log on, just click on the OK button and my window desktop screen open up to run my computer.

The last thing I did before this problem started was I disable my firewall and system security to download the updated Cox Security Suite Powered by McAfee and the download was successful. So I started with a full scan on the computer and check the little box to log off when the scan is finish.

When I came back to Log on like I usually do, with my user name type in and no password needed, so like I usually do I click the OK button to Logon to my desktop screen. But now a another window pop up saying a logon message your account has been disable please see your system administor.

So I call Cox-Tech solution, over the phone they said do this and that, which I did and that did not fix the problem so they said over the phone that it a McAfee problem and I should call them so I did and they try to help me, but could not. So they said I needed to call Microsoft. I call them, we try this and that and they could not fix the problem so they said that I needed to contact my administrator, where I purchase my computer from. So I call Dell and talk to a technician, he said he can fix the problem but before he start he needed same information ,on what I thank cause the problem, I mention it above

So now when I try to Log on another window come up saying this computer system #42D0051-595B is protected by a password authentication system you cannot access this data on this computer without the correct password, than it ask you to type in a primary or administrate password and click enter.

Dell technicians gave me two passwords to try but that did not work. After talking to them I notice that the password that was giving to me was a eight digit or units password when on my system I think it a need a nine digit or units password code.

After trying to do all the thing, I was told to do now my labtop wont start even in the safemod. I try to boot by press F8 key repeatedly but that same window came up said what I mention above.

If some one can help me fix this problem I will be thankful again. I have a Dell Labtop Inspiron/9100 with window XP – Professional 1-2cpu.-

thank you

Michael