📎 AI Summary:
The thread discusses a user trying to install the 64-bit version of Windows 7 on a Dell Optiplex 755 but facing issues despite having the correct installation disk. Responders clarify that a clean or custom install is necessary rather than an upgrade, emphasizing the importance of changing BIOS boot order. The original poster later confirms a workaround using a USB stick and inquires about activating Windows with their existing product key, which is reassured to be valid for both 32-bit and 64-bit versions. Overall, the guidance is helpful and the user’s concerns about activation are addressed positively.
CalebOConnell

CalebOConnell

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Thread Author #1
I have a dell optiplex 755 usff with an intel core 2 duo and a copy of windows 7 ultimate and the disks for x32 and x64 bit. I can install the 32 bit version of windows but not the x64 bit version to take advantage of my intel core 2 duos x64 bit compatibility with windows. How can I make the system read the x64 disc to install the x64 bit of windows 7. PC specs in photos w/error message.
 

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Solution
kemical
It sounds like your trying to do an 'upgrade installation' meaning your popping the disk or usb in and clicking install.

This won't work.

To properly upgrade to a 64bit system you need to perform whats called a custom or clean install. This means entering the bios and changing your boot order so that the media you have windows on is first in the boot queue.

How to Reinstall Windows 7 From Scratch
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kemical

kemical

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#2
It sounds like your trying to do an 'upgrade installation' meaning your popping the disk or usb in and clicking install.

This won't work.

To properly upgrade to a 64bit system you need to perform whats called a custom or clean install. This means entering the bios and changing your boot order so that the media you have windows on is first in the boot queue.

How to Reinstall Windows 7 From Scratch
 
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