I have an iMac 8,1 and it is supposedly not supposed to support 64bit, but I installed it anyway, so now my problem is that the bootcamp update (I think 2.1) wont install and I have to keep downloading it and installing it and it won't tell me it has unsuccessfully installed it just reboots and tells me I need the same update in the Apple Software Update. So my question is how do I only download it once - not a big one - and how do I get it to install?