Most of the time the default windows installations leaves the Administrator account active with a blank password to back door for cases like these.
First try logging in using username ADMINISTRATOR and don't type anything for the password. Click ok to see if that gets you in. If it does then you can go to your account settings and change the password for your default account. If not there may still be other ways but this is typically the easiest.
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Log in using SAFE MODE. While laptop boots, press F8 and it will prompt for which mode to login. Select 'SAFE MODE'. Once logged in try to restore the OS to a previous good restore point.
If you've a backup of the registry key, it will help better. Just restore the registry from the backup instead of going for an old restore point.
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If you are using windows XP Home or professional then at the user login screen press ctrl-alt-del three times and a new window will appear just enter username as "administrator" and leave the password field blank.
U may get in the system using this and then u can create a new administrator user.
If u are using some other OS then please specify the OS name.
You can try booting in the safemode to see whether the default administrator account is enabled. If it is there then log on to the administrator account and changed the password for the account.
If the administrator account is not enabled then you should have the Vista disc to do system restore. Boot the computer from the Windows VIsta disc.. when you see the setup screen look for Repair your computer link at the left bottom corner. Click that follow the instruction to do system restore.
IF you dont have the vista disc call you Acer support to find how to boot in to Win RE
Yes, when you switch the laptop on hold down the F8 key until you see a black screen with a list of white text, one of the options will be "Safe Mode", use the arrow keys to highlight safe mode (just safe mode, not safe mode with anything) and press return. The computer will start to the welcome screen and you will see a user-name you don't normally see called "Administrator". Click on Administrator and you will find it is not password protected (in spite of the fact that the Administrator account has more access to the system than any other account!) when the administrator profile loads it will ask you if you want to continue in safe mode and you do. click start, click control panel and click on users and groups now click on your son's user account and click remove password. now click back, click on the Administrator account and click change password, the old password should be left blank and you're new Administrator password should be something at least 7 letters, numbers and special characters (!@£$%^&*) long that you can remember.
Now just restart and let it start up normally, once loaded advise your son to set a password he can remember or at least write down somewhere safe.