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I have an old Vista box sitting around, and I'm thinking of upgrading it to Windows 7 64-bit, as it has 4gb of RAM. Well, I know that there's an "in-place" upgrade from Vista, but does it work from 32-bit to 64-bit?
Maxim Zaslavsky
Posted 2009-10-24T02:39:48.697
Reputation: 1 750
12
Nope
Windows 32bit to 64bit has never been supported.
If you are a fan and trust upgrading, you may want to take a look at "Windows Easy Transfer". This should allow you to move your accounts, documents, settings and a whole lot more to a temporary location whilst you can do a full install of the new Windows, then move all your stuff back.
32-bit and 64-bit Windows: frequently asked questions
Can I upgrade from a 32-bit version of Windows to a 64-bit version of Windows?
No. If you are currently running a 32-bit version of Windows, you can only perform an upgrade to another 32-bit version of Windows. Similarly, if you are running a 64-bit version of Windows Vista, you can only perform an upgrade to another 64-bit version of Windows Vista.
(this is from their Vista page, I cannot find it for 7, however I am 99.9999% sure it is the same!
William Hilsum
Posted 2009-10-24T02:39:48.697
Reputation: 111 572
2
Check this answer from Microsoft:
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RickH's link refers to a custom install.
While you cannot "upgrade" (as in an inplace upgrade) from Vista 32 to 7 64, you can perform a custom install.
http://windows.microsoft.com/en-US/windows7/help/upgrading-from-windows-vista-to-windows-7-custom
Just go through Setup like you would normally install an OS. Setup will only allow you to pick Custom Install. Instead of formatting your partition, just select the old partition as the target. Setup will warn you blah blah blah. Just click through.
Your old Users, Program Files, and Windows folder will be moved to a folder called Windows.old. And you will have a brand new Windows install to play with.
Note: Setup will overwrite your old bootfiles.
surfasb
Posted 2009-10-24T02:39:48.697
Reputation: 21 453
Technically, a clean install is not necessary. A custom install will keep your data, ableit, make them orphaned. – surfasb – 2011-12-28T01:22:44.750
I have purchased the retail 32-bit version of Win 7 Home Premium. But now I installed more RAM so want 64-bit version. Will the same DVD work? What about keys? Should I ask this as a separate question? – One-One – 2012-11-23T03:43:07.207
@desaivv You will need to obtain a 64-bit disk of the same edition of Windows (or burn your own following this guide I wrote - http://blog.williamhilsum.com/2011/04/how-to-install-any-version-of-windows.html )... but, your key should work fine.
– William Hilsum – 2012-11-24T02:09:39.463Thanks a lot. Would upvote it a lot more if I could. Cheers. – One-One – 2012-11-24T02:17:51.797
1There is NO upgrade from 32 bit to 64 bit operating systems. A clean install is required. This applies to Windows XP 32 to 64, Vista 32 to 64, and 7 32 to 64 (and every possible supported combination of version upgrades. – Multiverse IT – 2009-10-24T03:14:50.713
It finally worked for me. My OEM version did not have 64 bit source. It was not retail. I downloaded 64 bit ISO. My key worked and it is activated as well. Thanks. – One-One – 2013-04-04T05:32:09.397