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Some of the following information may remove data that you may wish to keep, make sure to do backups on the files you wish to keep.
Depending on how what you mean restore factory settings, you can achieve this by the following; you can do a restore to the first day you purchased it.
1. Click Start, point to All Programs, point to Accessories, point to System Tools, and then click System Restore. If you are prompted for an administrator password XXXXX confirmation, type the password XXXXX provide confirmation.
2. On the Welcome screen, click Restore my computer to an earlier time, and then click Next.
3. On the Select a Restore Point page, select the date from the calendar that shows the point you'd like to restore to, and then click next.
4. On the Confirm Restore Point Selection page, verify that the correct restore point is chosen, and then close any open programs.
5. Click Next if you are ready to proceed or click Back to change the restore point.
6. The computer will shut down automatically and reboot. On reboot, you'll see the Restoration Complete page, and then click OK.
After reviewing the stability of your system, you can choose another restore point or undo this restoration. Just open System Restore and make the appropriate choice. After you use System Restore, you'll have an additional task; Undo my last restoration, on the System Restore Welcome page. Remember that you'll have to reinstall any programs that were installed after the restore point.
If System Restore doesn't work in Normal Mode, it might work in Safe Mode. To use System Restore in Safe Mode, press the F8 key during reboot and choose Safe Mode. When your computer starts in either Safe Mode or Normal Mode, System Restore can be used to capture a working previous state. System Restore can't be opened unless the system is bootable into one of these modes.
Next if this isn't what you wish to achieve you can do a complete format and install, this will remove all data and you will have a clean install.
Here is a step by step instruction to installing Vista completely.
Finally if you are talking about the resetting the bios you can do the following
Go into the bios or it is might be called boot settings,
Hit the del key (Some Computers it is F1, F2, Esc)
Exit save changes
If you need more help Let me know
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