Where can I obtain or buy a Windows Vista Home Premium product key?

hi

Microsoft has moved on to Windows 7 and no longer sells Vista

and be very careful buying a Vista Product Key/Licencer online; a lot of them are pirated

you would be much better trying a local Computer repair Shop to see if they have ant leftover Vista Disks/licences

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or consider installing Windows 7:

if wishing to upgrade to Windows 7 it will depend if your laptop/computer manufacturer has windows 7 drivers available for your computer/laptop as to whether Windows 7 will work correctly on your machine

check with them

and read this

Windows 7 upgrade advisor

http://www.microsoft.com/downloads/en/details.aspx?FamilyID=1b544e90-7659-4bd9-9e51-2497c146af15

Windows 7 system requirements

http://windows.microsoft.com/en-us/windows7/products/system-requirements

Windows 7 upgrade paths

http://technet.microsoft.com/en-us/library/dd772579(WS.10).aspx

Compare Windows 7 Editions:

http://windows.microsoft.com/en-US/windows7/products/compare

Windows 7 Compatibility Center to check Software and Hardware Compatibility:

http://www.microsoft.com/windows/compatibility/windows-7/en-us/Default.aspx

Windows 7 Pricing:

http://www.microsoftstore.com/store/msstore/en_US/list/categoryID.50726100

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I see your original title was:   "original title: COA/Product key problem"

If you are having Activation problems with an existing Product Key, read this:

read below information on how to activate vista and how to get assistance with any problems that may occur

How to activate Windows Vista

**http://support.microsoft.com/kb/940315**

How to find a phone number for a Microsoft Product Activation Center

http://support.microsoft.com/kb/950929

if problem then continues:

1. click start, and in the Search box type: slui.exe 4
2. press ENTER on your keyboard
3. select your country.
4. take the phone activation option, and hold on for a real person instead of following the automatic prompt process

·                        when you do the phone activation process hold on for a real person to explain to there instead of following prompts for automatic scenario

or run a MGA Diagnostics Report and repost in the Vista Genuine Forum

When you login to Vista, a window with several options will be available, select the option to open your  Internet browser.

·        Type:http://go.microsoft.com/fwlink/?linkid=52012 into the browser address bar**.**

·        A window will come up prompting to “Run” or “Save”, select “Run”

·        When the MGA Diagnostic Tool starts running click the “Continue” button, when the diagnostics is complete click the “Copy” button.

·        Paste the report into a thread in the appropriateWindows Genuine Advantage forum

Here is where to repost that MGA Diagnostics Report

Issues relating to the Windows Vista Software Protection Platform - Non-Genuine dialog boxes, validation problems, or software licensing services messages.

http://social.microsoft.com/Forums/en-US/genuinevista/threads

Should have come with your Windows Vista installation media or on a sticker on your computer.

Otherwise:

http://windows.microsoft.com/en-US/windows-vista/products/get

"Microsoft no longer sells Windows Vista, though we will continue to support it."

If you want another license - you'll have to find some store (online or otherwise) who still sells WIndows Vista and buy a copy from them.