Description
Due to a problem with 64-bit Windows XP, Altera software may download incorrectly and installation may fail. For more information on this problem, see the Microsoft Knowledge Base, KB925336.
To work around this problem, download and install the patch file for Windows Server 2003, x64 Edition (KB925336) which is also applicable to 64-bit Windows XP. The patch is available from the following link http://support.microsoft.com/kb/925336.