Okay. Acer notebooks have an 'eRecovery' feature on the hard drive which will let you reset the computer back to factory setting, bypassing your lost account's password XXXXX well, in the process. . In order to access the eRecovery tool, please boot up your system and press Alt + F10 at the Acer splash screen, and use eRecovery to reset the factory settings for the system from the hidden partition included. If prompted for a password XXXXX the process, enter six zeros (default) accordingly; check if you are able to boot up Windows all right thereafter.

Keep me posted.

Regards

In that case, you may use a password XXXXX tool, ophcrack, to recover your account password. Please click on the following link:
http://ophcrack.sourceforge.net/download.php?type=livecd

Download the ophcrack Vista LiveCD.iso file. Once downloaded, please burn the ISO image to a CD/DVD disc, as follows:

http://www.petri.co.il/how_to_write_iso_files_to_cd.htm

After burning, bootup your system using the disc; the recovery tool will start automatically.

Follow the on-screen directions accordingly, and see if the tool is able to retrieve your account's password. Remove the disc as soon as the computer reboots, and load up your OS as you do normally, and see if you can login to your account now using the retrieved password.

If this doesn't work, you may order a set of recovery discs for your Acer model, using the following link:
https://secure.tx.acer.com/RCDB/Main.aspx?brand=acer

Enter the serial number provided at the back of your laptop, then click Submit. You will need to have a valid credit card to make the purchase, after which you may use the recovery discs provided to restore your laptop back to factory settings, resetting your password XXXXX the process.

Regards