You can not upgrade a 32 bit system to 64bit, a clean instalation is required. Read what Microsoft has to say.
I few days ago I built a new comp and bought the Vista Ultimate upgrade to finish off my new computer. I had Windows XP which is an exceptable upgrade to Vista according to Micrsofts website. For some reason when ever I put in the Windows Vista 64 bit DVD I get an error saying
The version of this file is not compatible with the version of windows you are running. Check System Information to see if you need 32 or 64 bit version of this program.
After that I tried doing a clean install by booting it from the DVD it woud check files then go to the blue screen and sit at the blue screen but blank. I let it sit at that screen for hours but it never did anything. So frustrated I put in the 32 bit of Vista Ultimate and it installed without a hitch. My comps running vista ultimate 32 with out problems but I really wanted to bump it up to 64 but even with Vista Ultimate 32 installed its STILL saying not compatible OS to run upgrade, it makes no sense. And yes my comp is able to run 64. I have to say that cause I know 50 people will ask if my system is 64 capable. And yes accordin to Microsofts website vista 32 is a compatible OS to upgrade to 64. So going back to XP will do nothing. Any suggests would be helpful thnx in advance.