Upgrade from XP 32bit to Win 7 64 bit

the answer is no in any and all cases, you cannot upgrade from a 32bit OS to a 64bit OS. You can however buy the full version, and if the link above by area51 approves your system then you can do a clean install of win7 64bit.
I know my Atom netbook ran win7 64 pro just fine on 1GB of ram (though the suggested minimum was 2GB), ran just as good as win7 basic (32bit) did. And I have installed win7 32bit on a Pentium 3 with no problems, it really is some flexible software. the biggest concern is having enough ram. Never run win7 with less than 1GB, and preferably 4GB whenever possible. But like I said, the link above will really let you know.
 
You absolutely can upagrade to Windows 7 64 bit from Windows XP 32 bit.

Here is a link from Microsoft on how to do just that:

http://windows.microsoft.com/en-US/windows7/help/upgrading-from-windows-xp-to-windows-7

To install a 64-bit version of Windows 7 on a computer running a 32-bit version of Windows XP

1.Insert the Windows 7 installation disc or USB flash drive, and then turn off your computer.

2.Restart your computer.

3.Press any key when prompted, and then follow the instructions that appear.

4.On the Install Windows page, enter your language and other preferences, and then click Next.

If the Install Windows page doesn't appear, and you're not asked to press any key, you might need to change some system settings. To learn how to do this, see Start your computer from a Windows 7 installation disc or USB flash drive.

5.On the Please read the license terms page, if you accept the license terms, click I accept the license terms, and then click Next.

6.On the Which type of installation do you want? page, click Custom.

7.Choose the partition containing Windows XP (this is often the computer's C: drive), and then click Next. (Do not select your external USB hard drive.)

8.In the Windows.old dialog box, click OK.

9.Follow the instructions to finish installing Windows 7, which include naming your computer and setting up an initial user account. You can use the same names that you used in Windows XP, or choose new ones.

Run the upgrade advisor to ensure that your hardware can support the upgrade first though.
Hope this helps.
 

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