I am currently running Windows 7 32-bit. I want to install Windows 8 Developer Preview 64-bit. Is it possible to install it with my existing Windows 7(32-bit) or is there any way to install Windows 8 developer preview 64-bit virtual on 32-bit PC or is there any to check if my PC is good for 64-bit OS.
I am having Intel Pentium Dual Core CPU E5300 2.60Ghz Processor, 2GB RAM.
Is your CPU 32-bit, or just your current install of Win7? Regardless, you won't be able to install/run 64-bit software from within a 32-bit runtime. This would most likely rule out the ability to perform an "upgrade install" as well.
A 32-bit operating system will boot/run the CPU in "protected mode", while 64-bit software requires that the CPU operate in "long mode". In short, you need to install from a native 64-bit runtime. Which you should be able to do by booting from the Win8 install disc, assuming your CPU is 64-bit capable.
The CPU does use a 64-bit instruction set: http://ark.intel.com/products/35300/Intel-Pentium-Processor-E5300-%282M-Cache-2_60-GHz-800-MHz-FSB%29
So just install the OS according to it's normal instructions, though, with a Pentium-class processor, your experience will be far, far from optimal.
To check whether or not your PC is "good" for a 64-bit OS, you'll have to find out which CPU you have, which you can do with System Properties (hit WINDOWS KEY+PAUSE).
Then look up the CPU that you're using and see if it supports x86-64.
If it does (most modern CPUs do) then you're good to go.
However, upgrading from a 32-bit OS to a 64-bit OS (even on a PC that supports 64-bit operating systems) is not supported as far as I know.
If you have 2GB or 3GB RAM, even with a 64-bit capable processor, I would install the 32-bit of Windows 8 Pro. It just seems to be more responsive for some reason. Many others have had the same experience.
Does my computer's CPU dictate whether I can install a 32-bit or a 64-bit operating system?
Specifically, I'd like to install Windows 7 64-bit on my machine that is currently Windows Vista 32-bit. In addition, can I go from 4GB to 8GB of RAM once I'm on a 64-bit OS?
Here's a spec chart for Intel Core2 Quad processors. According to the chart, your CPU does handle 64-bit OS's (Q9450, link to full specs), so you can install whichever you like.
As others have pointed out, once you're on a 64-bit OS, increasing RAM to 8GB will work if the motherboard supports it.
It would probably be a good idea to download the Windows 7 Upgrade Advisor and let it evaluate your system, hardware and software. There are issues beyond 64-bitness in an upgrade.
Your processor is either 64 or 32 bit. I believe all the c2q range is 64bit, so you should be fine to upgrade.
Additionally, you can go from 4GB of RAM to almost any number you can think of :)
In your case, you can use either 32-bit or 64-bit O/S without any problems. There are very few 64-bit OS only processors (Itanium?) around, and I don't know of any likely to be used at home.
And yes, you can go from 4GB to 8GB once you're on a 64-bit OS, as long as your motherboard supports it.
Yes, your machine will run a 64-bit OS, so you can install Windows 7 64-bit. I recommend a clean install (not sure if an upgrade is even possible from 32 to 64-bit). Once you're in a 64-bit OS, you'll be able to use 8GB of RAM.