One of the big news items for some users of AutoCAD is the availability of a 64-bit version of the product. 64-bit AutoCAD 2008 will behave almost identically to the 32-bit version, but will allow users to work with much larger datasets.
Developers and beta-testers have so far been downloading separate 32-bit and 64-bit versions of AutoCAD 2008, but the plan is to ship a single DVD that will install 32-bit AutoCAD 2008 on supported 32-bit Operating Systems and 64-bit AutoCAD 2008 on supported 64-bit Operating Systems.
If you have a 64-bit OS and have some of these expensive addons, then you really want to install AutoCAD as a 32-bit program. See here for a method that should allow you to install AutoCAD 2008 as 32-bit on your 64-bit computer if that's what you really need to do.
ahhh remark. its good to hear your soothing, metallic tones. win7 home premium. I have seen your post elsewhere to run in compatibility mode, which I have not tried. so far I have only tried making AutoCAD run on 64bit. should I be trying to make windows run as 32bit? many thanks, I know you have been invlolved in a good half of the posts I've read on this!
yes there is both versions available but I need the 32bit one so my add-ons work. there are various workarounds for 2008 which involve editing the aca.msi and setup.ini files but I have not got this to work for 2009. 2b1af7f3a8