| I found this on their site
Avid Knowledge Base
Pro Tools LE 8.0 for Windows XP and Vista System Requirements
Last Updated : January 6, 2012
Products Affected : Other, Pro_Tools_LE
Pro Tools LE 8.0 for Windows XP and Vista System Requirements
Windows Desktops - Pro Tools LE 8.0 FireWire & USB Systems
Windows Laptops - Pro Tools LE 8.0 FireWire Systems
Windows Laptops - Pro Tools LE 8.0 USB Systems
Pro Tools LE 8.0 for Windows General System Requirements
Pro Tools LE 8.0 for Windows XP and Vista has the following system requirements:
Installation Requirements
DVD drive required for Pro Tools LE 8.0 installation DVD
Not required for Download-only Pro Tools LE 8.0 installation
System Software
Windows Vista Business or Ultimate Edition
32-bit OS Installation Only
With Windows Vista Service Pack 1
Windows XP Professional or Home Edition
With Windows XP Service Pack 3
Not Supported:
Windows Vista 64-bit (any version)
Windows XP 64-bit
Windows XP Media Center Edition
Windows 98, Me, 2000, NT, 95, 3.1, DOS | 
