Not sure about the issue itself, but there a few things to do to identify the problem and to be able to install the product.
• The OS is compatible with AutoCAD LT 2008? AutoCAD LT 2008 is compatible with:
o Windows XP Pro (SP2 minimum)
o Windows XP Home Edition (SP2 minimum)
o Windows Vista Enterprise
o Windows Vista Business
o Windows Vista Ultimate
o Windows Vista Home Premium
o Windows Vista Home Basic
• The last version of the Windows installer is present in the system?
o The last Windows installer (4.5) can be downloaded from this location:
Windows Installer 4.5
• Your CD is damaged?
o Please try to copy the CD contents to a local directory in your hard drive and run the setup.exe from the newly copied directory. It works?
• Problems with the user profile?
o Please create a new Administrator account in the system, log with the new account and run the installation. Same problem?
Regards
Antonio Barroca
Autodesk Product Support
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Antonio Barroca
Product Support Specialist
Autodesk, Inc.