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I've downloaded the 64-bit version of AutoDesk Inventor 2012 Professional for my Windows Vista computer with the Service Pack2, but it tells me I need to download the Windows HotFix KB971138 to finish installments. I've followed the link provided and such but there are three options to choose from. Which do I need?
http://support.microsoft.com/hotfix/KBHotfix.aspx?kbnum=971138&kbln=en-us
As you have downloaded the 64bit version of Inventor I assume you are appling the hotfix to a 64bit OS. You will need the x64 download (the middle one). The ia64 download is for Intel Itanium server systems.
Regards
Martin