I Had Win XP in My PC. I just install win Vista Ultimate by upgrading not by custome option which install vista in new and delete previous stuff in os. Now i have win vista 32 bit ultimate and want to install win vista 64 Bit Ultimate But when i run setup it give's error like this Error Message: The version of this file is not compatible with version of windows you're running. Check your computer's system information to see whether you need an x86 (32 bit) or x64 (64 bit) version of the program, and then contact the software publisher. Plz help me how can i install 64Bit Vista Ultimate Ram Naresh Pal

I don't think you can upgrade an upgrade. You either have to wipe the HDD & start from scratch or create a dual boot setup. Another possibility that *might* work would be to roll back to WinXP, then upgrade to Vista 64 from there....not sure about that though. Just curious, why do you have so much RAM?

Is your hardware (board, processor, etc.) 64-bit? "So won’t you give this man his wings What a shame To have to beg you to see We’re not all the same What a shame" - Shinedown

Hi from this link , which i found a bit confusing about upgrade paths http://support.microsoft.com/kb/932795 see "Installing a 64-bit version of Windows Vista on computer that is running a 32-bit version of Windows Vista" as it states the installer wont run on a 32 bit OS, fine,, but everyone uses the dvd boot loader so im not sure what is meant there. i'd try the upgradeadvisor see if that throws any light on it.

Hi You need 64 bit compatable Motherboard