lost password, no recovery dvds, vista premium

I have an acerM610 desktop running Vista Home Premium. Someone put a password on the only admin account on the machine and now cannot remember what is is. Only the guest account is accessible. They did not create the recovery DVDs. How do I rebuild the system without the password. The repair utility requires the passwoord. Thanks for your help
ginchoAsked:
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rindiConnect With a Mentor Commented:
Boot the PC with a UBCD. It includes a utility to reset windows passwords in the filesystem tools.

http://ultimatebootcd.com
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flyingskyCommented:
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CreditSoupTechCommented:
Just boot to a command prompt and perform the following.
1. Change directory to c:/windows/system32
2. move Utilman.exe Utilman.old
3. copy cmd.exe Utilman.exe
Reboot and Press "Windows Key + U"

Then Just start explorer.exe or creat a new admin account with the commands below
Create Admin Account
net user newadmin password /add
net localgroup administrators newadmin /add
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TDKDCommented:
Hi gincho,

The best course of action here is for you to contact the hardware manuafactuer. In this case, Acer's technical support will most likely have a backdoor password in order for you to Re-Image it.
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