The windows Vista start menu can be customised during an unattended installation by deleting links/shortcuts from the "All Users" user profile. Create a batch file with the relevent deletion commands and call the batch file from a synchronous command during the unattended build (or run each deletion as a separate command).

Example:

del "C:\Users\All Users\Start Menu\Programs\Extras and Upgrades\Windows Anytime Upgrade.lnk"

File Path Reference:

C:\Users\All Users\Start Menu\Programs\desktop.ini
C:\Users\All Users\Start Menu\Programs\Windows Calendar.lnk
C:\Users\All Users\Start Menu\Programs\Windows Collaboration.lnk
C:\Users\All Users\Start Menu\Programs\Windows Contacts.lnk
C:\Users\All Users\Start Menu\Programs\Windows Defender.lnk
C:\Users\All Users\Start Menu\Programs\Windows Fax and Scan.lnk
C:\Users\All Users\Start Menu\Programs\Windows Live.lnk
C:\Users\All Users\Start Menu\Programs\Windows Mail.lnk
C:\Users\All Users\Start Menu\Programs\Windows Movie Maker.lnk
C:\Users\All Users\Start Menu\Programs\Windows Photo Gallery.lnk
C:\Users\All Users\Start Menu\Programs\Accessories\Calculator.lnk
C:\Users\All Users\Start Menu\Programs\Accessories\Desktop.ini
C:\Users\All Users\Start Menu\Programs\Accessories\Mobility Center.lnk
C:\Users\All Users\Start Menu\Programs\Accessories\NetworkProjection.lnk
C:\Users\All Users\Start Menu\Programs\Accessories\Paint.lnk
C:\Users\All Users\Start Menu\Programs\Accessories\Remote Desktop Connection.lnk
C:\Users\All Users\Start Menu\Programs\Accessories\Sidebar.lnk
C:\Users\All Users\Start Menu\Programs\Accessories\Snipping Tool.lnk
C:\Users\All Users\Start Menu\Programs\Accessories\Sound Recorder.lnk
C:\Users\All Users\Start Menu\Programs\Accessories\Sync Center.lnk
C:\Users\All Users\Start Menu\Programs\Accessories\Welcome Center.lnk
C:\Users\All Users\Start Menu\Programs\Accessories\Wordpad.lnk
C:\Users\All Users\Start Menu\Programs\Accessories\Accessibility\Desktop.ini
C:\Users\All Users\Start Menu\Programs\Accessories\Accessibility\Speech Recognition.lnk
C:\Users\All Users\Start Menu\Programs\Accessories\System Tools\Backup.lnk
C:\Users\All Users\Start Menu\Programs\Accessories\System Tools\Character Map.lnk
C:\Users\All Users\Start Menu\Programs\Accessories\System Tools\Desktop.ini
C:\Users\All Users\Start Menu\Programs\Accessories\System Tools\dfrgui.lnk
C:\Users\All Users\Start Menu\Programs\Accessories\System Tools\Disk Cleanup.lnk
C:\Users\All Users\Start Menu\Programs\Accessories\System Tools\migwiz.lnk
C:\Users\All Users\Start Menu\Programs\Accessories\System Tools\System Information.lnk
C:\Users\All Users\Start Menu\Programs\Accessories\System Tools\System Restore.lnk
C:\Users\All Users\Start Menu\Programs\Accessories\System Tools\Task Scheduler.lnk
C:\Users\All Users\Start Menu\Programs\Accessories\Tablet PC\Desktop.ini
C:\Users\All Users\Start Menu\Programs\Accessories\Tablet PC\Sticky Notes.lnk
C:\Users\All Users\Start Menu\Programs\Accessories\Tablet PC\TabTip.lnk
C:\Users\All Users\Start Menu\Programs\Accessories\Tablet PC\Windows Journal.lnk
C:\Users\All Users\Start Menu\Programs\Administrative Tools\Computer Management.lnk
C:\Users\All Users\Start Menu\Programs\Administrative Tools\Data Sources (ODBC).lnk
C:\Users\All Users\Start Menu\Programs\Administrative Tools\desktop.ini
C:\Users\All Users\Start Menu\Programs\Administrative Tools\Event Viewer.lnk
C:\Users\All Users\Start Menu\Programs\Administrative Tools\iSCSI Initiator.lnk
C:\Users\All Users\Start Menu\Programs\Administrative Tools\Memory Diagnostics Tool.lnk
C:\Users\All Users\Start Menu\Programs\Administrative Tools\Print Management.lnk
C:\Users\All Users\Start Menu\Programs\Administrative Tools\Reliability and Performance Monitor.lnk
C:\Users\All Users\Start Menu\Programs\Administrative Tools\Security Configuration Management.lnk
C:\Users\All Users\Start Menu\Programs\Administrative Tools\services.lnk
C:\Users\All Users\Start Menu\Programs\Administrative Tools\System Configuration.lnk
C:\Users\All Users\Start Menu\Programs\Administrative Tools\Task Scheduler.lnk
C:\Users\All Users\Start Menu\Programs\Administrative Tools\Windows Firewall with Advanced Security.lnk
C:\Users\All Users\Start Menu\Programs\Extras and Upgrades\Desktop.ini
C:\Users\All Users\Start Menu\Programs\Extras and Upgrades\Small Business Resources.lnk
C:\Users\All Users\Start Menu\Programs\Extras and Upgrades\Windows Anytime Upgrade.lnk
C:\Users\All Users\Start Menu\Programs\Extras and Upgrades\Windows Marketplace.lnk
C:\Users\All Users\Start Menu\Programs\Extras and Upgrades\Windows Web.lnk
C:\Users\All Users\Start Menu\Programs\Games\Desktop.ini
C:\Users\All Users\Start Menu\Programs\Games\GameExplorer.lnk
C:\Users\All Users\Start Menu\Programs\Maintenance\Backup and Restore Center.lnk
C:\Users\All Users\Start Menu\Programs\Maintenance\Desktop.ini
C:\Users\All Users\Start Menu\Programs\Maintenance\Problem Reports and Solutions.lnk
C:\Users\All Users\Start Menu\Programs\Maintenance\Remote Assistance.lnk
C:\Users\All Users\Start Menu\Programs\Startup\desktop.ini
C:\Users\All Users\Start Menu\Programs\Tablet PC\Desktop.ini