Offline NT Password Reset is a good suggestion to recover or reset the password. However, to be able to use this tool you will need to boot directly into it, which poses a few problems depending on how your Virtual PC is set up. Here are some instructions that worked for me (Windows 7 host / VPC).
Firstly, mount the ISO as the DVD drive:
- Ensure the VPC is powered down
- Download and unzip the ISO from the above website
- Right-click the VPC > Settings > DVD Drive > Browse to the ISO > OK
If Integration Settings are enabled on your VPC, you won't get a chance to boot into the BIOS to change the boot order, so do the following:
- Start the VPC
- Select Tools > Disable Integration Settings (the Windows password screen will appear)
- Select Action > Restart from the VPC menu
You should now be able to enter the BIOS:
- Start the VPC
- Hit DEL key before it boots up (you have to be quick)
- Set CD-ROM as the first boot device
- Close and save your BIOS settings
It should now boot into the Offline NT Password Reset tool. The following options worked for me:
- Select drive (2)
- Confirm config folder (enter)
- Select part of registry (1)
- Edit passwords (1)
- Select user (enter username)
- Clear password (1)
- Quit and save changes (!, q, y, n)
You can now dismount the DVD Drive (Tools > Settings), then reboot the VPC.
When Windows boots up, select Enable Integration Features from the VPC Tools menu, and (optionally) set a new password for the user from the Control Panel.