Enable the local Administrator account in Vista

1. Click on Vista Start button, then go to Control Panel.
2. Inside Control Panel, click on System and Maintenance link, follow by Administrator Tools at the bottom.
3. An Administrator Tools window appears. From there, click on Local Security Policy applet.
4. Alternatively, type secpol.msc in Start Search box and press Enter.
5. Click Continue on User Account Control’s Windows needs your permission to continue running Microsoft Management Console (MMC) dialog box.
6. On the left pane of Local Security Policy MMC, expand Security Settings (should be opened by default), then expand Local Policies.
7. Click on Security Options branch.
8. Double click on Accounts: Administrator account status setting, then select Enabled radio button on Local Security Setting tab of Properties window.
9. Click on OK button.
10. Log off, switch user of restart your computer to logon with activated Administrator account.